Researchers: a zero-day vulnerability in Adobe Reader has been actively exploited since at least December 2025, and some docs contain Russian-language lures (Sergiu Gatlan/BleepingComputer)

Sergiu Gatlan / BleepingComputer: Researchers: a zero-day vulnerability in Adobe Reader has been actively exploited since at least December 2025, and some docs contain Russian-language lures — Attackers have been exploiting a zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December.