Adobe Systems Inc. released an update for its Reader and Acrobat PDF file viewing software, plugging a known hole in the application.
The flaw was identified in Adobe Reader 9.1, Acrobat 9.1 and earlier versions. A second vulnerability was also addressed. It appears to affect users running Adobe Reader on UNIX, Adobe said.
According to statistics released by security vendor F-Secure Corp., attacks exploiting Adobe with malicious PDF files are rising. Adobe Acrobat Reader attacks accounted for 48.8% of targeted attacks so far in 2009, F-Secure said in a blog posting earlier this month. The targeted Adobe attacks were followed closely by Microsoft's Office Suite Word, Excel and PowerPoint files.