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Adobe Reader Zero-Day Exploited via Malicious PDFs Since December 2025

By Hacker News

· 33 views

rssImage-92f964e6e9c703d8b268eee89b26f30b.jpeg

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 

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