This indicates an attack attempt against a memory-corruption vulnerability in
Adobe Reader and Acrobat.
The vulnerability is caused by an error when the vulnerable software handles
a malformed PDF file. It may allow a remote attacker to execute arbitrary code.
Adobe Reader 9.3.2 and earlier versions for Windows, Macintosh, and UNIX
Adobe Acrobat 9.3.2 and earlier versions for Windows and Macintosh
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the update from the vendor: