This indicates an attack attempt to exploit a Memory Corruption vulnerability in Windows PDF Library.
The vulnerability is due to an error when the vulnerable software handles a maliciously 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.
Windows Server 2012 and Windows Server 2012 R2
Server Core installation option
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.