{"id":3665,"date":"2026-04-09T11:15:00","date_gmt":"2026-04-09T11:15:00","guid":{"rendered":"http:\/\/infosec-daily.com\/?page_id=3665"},"modified":"2026-04-09T11:15:00","modified_gmt":"2026-04-09T11:15:00","slug":"adobe-reader-zero-day-exploited-via-malicious-pdfs-since-december-2025","status":"publish","type":"page","link":"https:\/\/infosec-daily.com\/?page_id=3665","title":{"rendered":"Adobe Reader Zero-Day Exploited via Malicious PDFs Since December 2025"},"content":{"rendered":"<p>Threat actors have been exploiting a previously unknown zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December\u00a02025.<br \/>\nThe finding, detailed by EXPMON&#8217;s Haifei Li, has\u00a0been described as a highly-sophisticated PDF exploit.\u00a0The artifact (&#8220;Invoice540.pdf&#8221;) first appeared on the VirusTotal platform on November 28, 2025.\u00a0A second\u00a0<\/p>","protected":false},"excerpt":{"rendered":"<p>Threat actors have been exploiting a previously unknown zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December\u00a02025. The finding, detailed by EXPMON&#8217;s Haifei Li, has\u00a0been&hellip;<\/p>\n","protected":false},"author":1,"featured_media":3666,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"saved_in_kubio":false,"footnotes":""},"class_list":["post-3665","page","type-page","status-publish","has-post-thumbnail","hentry"],"kubio_ai_page_context":{"short_desc":"","purpose":"general"},"_links":{"self":[{"href":"https:\/\/infosec-daily.com\/index.php?rest_route=\/wp\/v2\/pages\/3665","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/infosec-daily.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/infosec-daily.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/infosec-daily.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/infosec-daily.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3665"}],"version-history":[{"count":0,"href":"https:\/\/infosec-daily.com\/index.php?rest_route=\/wp\/v2\/pages\/3665\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/infosec-daily.com\/index.php?rest_route=\/wp\/v2\/media\/3666"}],"wp:attachment":[{"href":"https:\/\/infosec-daily.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3665"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}