This indicates an attack attempt to exploit a Memory Corruption vulnerability in Microsoft Office.
The vulnerability is due to improper handling of certain objects when the vulnerable software attempts to access a specially crafted rtf file. An attacker can exploit this to execute arbitrary code within the context of the logged in user via a crafted rtf file.
Microsoft Office 2007
Microsoft Office 2010
Microsoft Office 2013
Microsoft Office 2013 RT
Microsoft Office for Mac 2011
Microsoft Office 2016 for Mac
Microsoft Office Compatibility Pack Service Pack 3
Microsoft Word Viewer
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.