This indicates an attempt to exploit a Remote Code Execution vulnerability in Microsoft Word.
The vulnerability is caused by an error when the vulnerable software handles a malformed Word file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted Word file.
Microsoft Word 2007 Service Pack 3
Microsoft Word Viewer
Microsoft Office Compatibility Pack Service Pack 3
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.