This indicates an attack attempt to exploit a Memory Corruption vulnerability in Adobe Acrobat and Reader.
The vulnerability is due to an improper boundary check condition in the application when handling a crafted PDF file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted PDF file.
Adobe Reader (10.1.3.23) and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade to the latest version of Adobe Acrobat