Adobe has announced a critical vulnerability in Reader 9.3.2 and earlier, and Flash Player 10.0.45.2 and earlier, that could let attackers take control of users PCs.
There is no patch available at this time, but Adobe suggests installing Flash Player 10.1 (currently in release candidate status) to mitigate the risk. For Reader and Acrobat (on Windows):
Deleting, renaming, or removing access to the authplay.dll file that ships with Adobe Reader and Acrobat 9.x mitigates the threat for those products, but users will experience a non-exploitable crash or error message when opening a PDF file that contains SWF content.
The authplay.dll that ships with Adobe Reader and Acrobat 9.x for Windows is typically located at C:Program FilesAdobeReader 9.0Readerauthplay.dll for Adobe Reader or C:Program FilesAdobeAcrobat 9.0Acrobatauthplay.dll for Acrobat.