Users are being urged to use caution when handling PDF files following the discovery and subsequent attack of a flaw in Adobe software.
The company said that it had received reports of attacks targeting a previously unknown flaw in both Adobe Reader and Acrobat. When exploited, the flaw allows an attacker to remotely execute code on a targeted system.
The infected files trigger a memory buffer overflow, which in turn allows the attacker to remotely execute code on the targeted system.
"Right now we believe these files are only being used in a smaller set of targeted attacks," wrote researcher Steven Adair.
"However, these types of attacks are frequently the most damaging and it is only a matter of time before this exploit ends up in every exploit pack on the internet."