This indicates an attack attempt to exploit a remote Code Execution vulnerability in Microsoft Word.
The vulnerability is caused by an error that occurs when the vulnerable application handles a malicious "rtf" file. A remote attack may be able to exploit this to execute arbitrary code on the affected system.
Microsoft Office 2003 Service Pack 3
Microsoft Office 2007 Service Pack 2
Microsoft Office 2007 Service Pack 3
Microsoft Office 2010 Service Pack 1 (32-bit editions)
Service Pack 1 (64-bit editions)
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.