This indicates an attack attempt to exploit a Memory Corruption vulnerability in Foxit PDF Toolkit.
The vulnerability is caused by an error that occurs when the vulnerable software handles a malformed 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.
Foxit PDF Toolkit 2.0
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.