{"id":120945,"date":"2026-02-06T10:44:20","date_gmt":"2026-02-06T09:44:20","guid":{"rendered":"http:\/\/nfirjun2026.local\/?p=120945"},"modified":"2026-02-06T10:46:18","modified_gmt":"2026-02-06T09:46:18","slug":"infostealers-hide-in-rogue-pdf-software","status":"publish","type":"post","link":"https:\/\/www.cyber-security-online.nl\/en\/infostealers-hide-in-rogue-pdf-software\/","title":{"rendered":"Infostealers hide in rogue PDF software"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"120945\" class=\"elementor elementor-120945 elementor-120944\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-0aa8985 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"0aa8985\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f1a5a47\" data-id=\"f1a5a47\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-08c2d9a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"08c2d9a\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-73720f4\" data-id=\"73720f4\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2ec64e4 elementor-widget elementor-widget-text-editor\" data-id=\"2ec64e4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Cybercriminals are increasingly using deceptive PDF editors to spread infostealers. This malicious software nestles into systems, collects login credentials and can lead to serious data breaches. How do you recognize this threat and what can you do to limit damage?  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-5a834b1\" data-id=\"5a834b1\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ba6043f elementor-widget elementor-widget-heading\" data-id=\"ba6043f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Download nu zonder uw gegevens achter te laten.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8bf9deb elementor-widget elementor-widget-image\" data-id=\"8bf9deb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"1536\" src=\"https:\/\/www.cyber-security-online.nl\/wp-content\/uploads\/2026\/02\/Top-10-kwetsbaarheden-boek2.jpg\" class=\"attachment-full size-full wp-image-121023\" alt=\"Een whitepaper getiteld &quot;Top 10 Meest Voorkomende Kwetsbaarheden bij Nederlandse Gemeenten&quot; van NFIR Cyber Security Experts over de meest voorkomende kwetsbaarheden bij gemeenten wordt staand getoond.\" srcset=\"https:\/\/www.cyber-security-online.nl\/wp-content\/uploads\/2026\/02\/Top-10-kwetsbaarheden-boek2.jpg 1024w, https:\/\/www.cyber-security-online.nl\/wp-content\/uploads\/2026\/02\/Top-10-kwetsbaarheden-boek2-200x300.jpg 200w, https:\/\/www.cyber-security-online.nl\/wp-content\/uploads\/2026\/02\/Top-10-kwetsbaarheden-boek2-683x1024.jpg 683w, https:\/\/www.cyber-security-online.nl\/wp-content\/uploads\/2026\/02\/Top-10-kwetsbaarheden-boek2-768x1152.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-63b34f7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"63b34f7\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-096b58c\" data-id=\"096b58c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1fabc7a elementor-widget elementor-widget-text-editor\" data-id=\"1fabc7a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5c4f41ac elementor-widget elementor-widget-heading\" data-id=\"5c4f41ac\" data-element_type=\"widget\" data-widget_type=\"heading.default\"><div class=\"elementor-widget-container\"><h2 class=\"elementor-heading-title elementor-size-default\">Threat description<\/h2><\/div><\/div><div class=\"elementor-element elementor-element-6cc347f9 elementor-widget elementor-widget-text-editor\" data-id=\"6cc347f9\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\"><div class=\"elementor-widget-container\"><p><span class=\"TextRun SCXW145206827 BCX0\" lang=\"NL-NL\" xml:lang=\"NL-NL\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">There<\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">  is a<\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">n increase zi<\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">chtb<\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">spike in  <\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">a<\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">llen tricking users into installing a malicious PDF editor.<\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">  Once these<\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">  software is active, a  <\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">infostealer<\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">  installed that zi<\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">ch in the s<\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">y system settles and builds persistence.  <\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">Infostealers<\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">  can come up on systems by (targeted)  <\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">phishing campaigns<\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">  or by downloading manipulated software<\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">  and  <\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">can lead to data breaches by capturing login credentials (username and password) of corporate accounts. This allows unauthorized persons, for example, to log into mailboxes or corporate environments (such as SharePoint or Google   <\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">Workplace<\/span><span class=\"NormalTextRun SCXW145206827 BCX0\" data-ccp-parastyle=\"No Spacing\">), where important or sensitive company information is stored.<\/span><\/span><span class=\"EOP SCXW145206827 BCX0\" data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/p><\/div><\/div><div class=\"elementor-element elementor-element-48b456f7 elementor-widget elementor-widget-heading\" data-id=\"48b456f7\" data-element_type=\"widget\" data-widget_type=\"heading.default\"><div class=\"elementor-widget-container\"><h2 class=\"elementor-heading-title elementor-size-default\"><span class=\"TextRun SCXW133249477 BCX0\" lang=\"NL-NL\" xml:lang=\"NL-NL\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW133249477 BCX0\" data-ccp-parastyle=\"heading 2\">What potential impact does this Confluence vulnerability have?<\/span><\/span><span class=\"EOP SCXW133249477 BCX0\" data-ccp-props=\"{\"134245418\":true,\"134245529\":true,\"335559738\":160,\"335559739\":80}\"> <\/span><\/h2><\/div><\/div><div class=\"elementor-element elementor-element-453dc672 elementor-widget elementor-widget-text-editor\" data-id=\"453dc672\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\"><div class=\"elementor-widget-container\"><p><span data-contrast=\"none\">What steps should be taken after it is clear that an infostealer is present within your system depends on your goal:<\/span><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/p><ul><li aria-setsize=\"-1\" data-leveltext=\"\u2192\" data-font=\"Calibri\" data-listid=\"14\" data-list-defn-props=\"{\"335551671\":0,\"335552541\":1,\"335559685\":720,\"335559991\":360,\"469769226\":\"Calibri\",\"469769242\":[8226],\"469777803\":\"left\",\"469777804\":\"\u2192\",\"469777815\":\"hybridMultilevel\"}\" data-aria-posinset=\"0\" data-aria-level=\"1\"><span data-contrast=\"none\">Want to know how the infostealer got onto the device and what information may have been captured? If so, the device in question should be forensically examined. To do this, the device must be disconnected from the Internet and transferred for examination. Important: the device should not be reinstalled, as this will remove traces that may be crucial to answering these questions. NFIR can provide support for this type of investigation.    <\/span><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/li><\/ul><ul><li aria-setsize=\"-1\" data-leveltext=\"\u2192\" data-font=\"Calibri\" data-listid=\"14\" data-list-defn-props=\"{\"335551671\":0,\"335552541\":1,\"335559685\":720,\"335559991\":360,\"469769226\":\"Calibri\",\"469769242\":[8226],\"469777803\":\"left\",\"469777804\":\"\u2192\",\"469777815\":\"hybridMultilevel\"}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Do you only want to remove the infostealer? Then the recommendation is to reinstall the device. This will remove the infostealer as well as any system modifications made by the infostealer.  <\/span><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/li><\/ul><p><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/p><p><span data-contrast=\"none\">In both cases, it is recommended that:<\/span><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/p><ul><li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"15\" data-list-defn-props=\"{\"335552541\":1,\"335559685\":720,\"335559991\":360,\"469769226\":\"Symbol\",\"469769242\":[8226],\"469777803\":\"left\",\"469777804\":\"\uf0b7\",\"469777815\":\"hybridMultilevel\"}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Change all passwords, including system passwords, browser stored passwords and company account passwords.<\/span><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/li><\/ul><ul><li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"15\" data-list-defn-props=\"{\"335552541\":1,\"335559685\":720,\"335559991\":360,\"469769226\":\"Symbol\",\"469769242\":[8226],\"469777803\":\"left\",\"469777804\":\"\uf0b7\",\"469777815\":\"hybridMultilevel\"}\" data-aria-posinset=\"2\" data-aria-level=\"1\"><span data-contrast=\"none\">Terminate all active sessions of the affected user. Simply resetting the password is not sufficient for this purpose. <\/span><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/li><\/ul><p><span data-ccp-props=\"{}\"> <\/span><\/p><\/div><\/div><div class=\"elementor-element elementor-element-4bfa6c6 elementor-widget elementor-widget-heading\" data-id=\"4bfa6c6\" data-element_type=\"widget\" data-widget_type=\"heading.default\"><div class=\"elementor-widget-container\"><h2 class=\"elementor-heading-title elementor-size-default\">Prevent<\/h2><\/div><\/div><div class=\"elementor-element elementor-element-ae83033 elementor-widget elementor-widget-text-editor\" data-id=\"ae83033\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\"><div class=\"elementor-widget-container\"><p><span data-contrast=\"none\">As indicated, infostealers can enter through phishing or by downloading manipulated software. To prevent this, it is advisable to take the following measures: <\/span><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/p><ul><li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"16\" data-list-defn-props=\"{\"335552541\":1,\"335559685\":720,\"335559991\":360,\"469769226\":\"Symbol\",\"469769242\":[8226],\"469777803\":\"left\",\"469777804\":\"\uf0b7\",\"469777815\":\"hybridMultilevel\"}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Limit use of unapproved software. As an organization, make reliable software (such as a PDF editor) available centrally so that employees do not have to search for alternatives themselves. Combine this with application control (allowlisting), so that only approved software can be installed and run.  <\/span><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/li><\/ul><ul><li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"16\" data-list-defn-props=\"{\"335552541\":1,\"335559685\":720,\"335559991\":360,\"469769226\":\"Symbol\",\"469769242\":[8226],\"469777803\":\"left\",\"469777804\":\"\uf0b7\",\"469777815\":\"hybridMultilevel\"}\" data-aria-posinset=\"2\" data-aria-level=\"1\"><span data-contrast=\"none\">Use a password manager to securely store login information instead of keeping passwords in the browser.<\/span><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/li><\/ul><ul><li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"16\" data-list-defn-props=\"{\"335552541\":1,\"335559685\":720,\"335559991\":360,\"469769226\":\"Symbol\",\"469769242\":[8226],\"469777803\":\"left\",\"469777804\":\"\uf0b7\",\"469777815\":\"hybridMultilevel\"}\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"none\">Use a monitoring service so that quick action can be taken when an infostealer is installed and further damage can be mitigated.<\/span><span data-ccp-props=\"{\"201341983\":0,\"335559739\":0,\"335559740\":240}\"> <\/span><\/li><\/ul><p><span data-ccp-props=\"{}\"> <\/span><\/p><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c3c1a82 elementor-widget elementor-widget-spacer\" data-id=\"c3c1a82\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fae6a9f elementor-widget elementor-widget-text-editor\" data-id=\"fae6a9f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Have you been a victim of this form of phishing or want to hear more about it? If so, use the button below.   <\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1293aaa elementor-align-center elementor-widget elementor-widget-button\" data-id=\"1293aaa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.cyber-security-online.nl\/en\/pentesten-security-audits-to-test-your-digital-resilience-2\/get-a-pen-test-done-now\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Check my organization<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-10816bb elementor-widget elementor-widget-spacer\" data-id=\"10816bb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5a12841 elementor-widget elementor-widget-text-editor\" data-id=\"5a12841\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Bent u benieuwd naar een voorbeeld rapportage van een pentest?\u00a0<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-31c7fb9 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"31c7fb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.cyber-security-online.nl\/en\/pentesten-security-audits-to-test-your-digital-resilience-2\/request-pentest-report\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Voorbeeld rapportage Pentest<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Centric and IT security specialist NFIR are joining forces to support municipalities with cybersecurity services. 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