Apr 09, 2026 • Sergiu Gatlan
Hackers exploiting Acrobat Reader zero-day flaw since December
A critical zero-day vulnerability in Adobe Reader is being actively exploited by threat actors since at least December. Attackers are using maliciously...
Executive Summary
A critical zero-day vulnerability in Adobe Reader is being actively exploited by threat actors since at least December. Attackers are using maliciously crafted PDF documents to compromise systems, allowing remote code execution. This represents a significant risk as Adobe Reader is widely deployed across enterprises globally. The vulnerability has no available patch at the time of disclosure, making it highly valuable to threat actors. Organizations should consider restricting PDF handling, implementing network-level protections, and monitoring for suspicious PDF attachments in email traffic. User awareness training should emphasize not opening unexpected PDF attachments.
Summary
Attackers have been exploiting a zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December. [...]
Published Analysis
A critical zero-day vulnerability in Adobe Reader is being actively exploited by threat actors since at least December. Attackers are using maliciously crafted PDF documents to compromise systems, allowing remote code execution. This represents a significant risk as Adobe Reader is widely deployed across enterprises globally. The vulnerability has no available patch at the time of disclosure, making it highly valuable to threat actors. Organizations should consider restricting PDF handling, implementing network-level protections, and monitoring for suspicious PDF attachments in email traffic. User awareness training should emphasize not opening unexpected PDF attachments. Attackers have been exploiting a zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December. [...] Attackers have been exploiting a zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December. [...]