This indicates an attack attempt to exploit a Use After Free vulnerability in Microsoft Office.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted EPS file. As a result, a remote attacker can exploit this to execute arbitrary code, via a crafted EPS file.
Microsoft Office 2010 Service Pack 2 (32-bit editions)
Microsoft Office 2010 Service Pack 2 (64-bit editions)
Microsoft Office 2013 Service Pack 1 (32-bit editions)
Microsoft Office 2013 Service Pack 1 (64-bit editions)
Microsoft Office 2016 (32-bit edition)
Microsoft Office 2016 (64-bit edition)
System Compromise: Remote attackers can gain control of vulnerable systems
Apply the most recent upgrade or patch from the vendor.