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Dark Reading
An attacker has been using maliciously crafted PDF files to exploit a zero-day in Adobe Acrobat and Reader for at least four months.
The Hacker News
Threat actors have been exploiting a previously unknown zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December 2025. The finding, detailed by EXPMON's Haifei Li, has been described as a highly-sophisticated PDF exploit. The artifact ("Invoice540.pdf") first appeared on the VirusTotal platform on November 28, 2025. A second