Adobe warned of reports of an attack exploiting a hole in Reader and Acrobat on Monday.
"This afternoon, Adobe received reports of a vulnerability in Adobe Reader and Acrobat 9.2 and earlier versions being exploited in the wild," the company said in an advisory on its Security Incident Response Team blog. "We are currently investigating this issue and assessing the risk to our customers. We will provide an update as soon as we have more information."
Three different security vendor partners reported the alleged exploit to the company on Monday afternoon, said Adobe spokeswoman Wiebke Lips. She said she could not provide more details.
Last week, Adobe released a critical update affecting Flash Player and Adobe AIR.
Meanwhile, some Macintosh users were reporting on the Adobe Forums site that they were having problems installing an update from October that resolved a critical vulnerability in Adobe Reader and Acrobat 9.1.3 that had reportedly been exploited in the wild.
Updated 6:01 p.m. PST with Mac user problems installing update.