A critical vulnerability has been identified in Adobe Reader 9.3 for Windows, Macintosh and UNIX, Adobe Acrobat 9.3 for Windows and Macintosh, and Adobe Reader 8.2 and Acrobat 8.2 for Windows and Macintosh.
It is recommended that users of Adobe Reader 9.3 and earlier versions for Windows, Macintosh and UNIX update to Adobe Reader 9.3.1.
Read more / Get it at: adobe.com/support/security/bulletins/apsb10-07.html
Or get an alternative pdf reader like Foxit Reader (foxitsoftware.com/pdf/reader/)