This indicates an attack attempt against a memory-corruption vulnerability in Microsoft Office Word.
The vulnerability is caused by an error when the vulnerable software parses a malformed RTF file. It may allow a remote attacker to execute arbitrary code by convincing a victim to open a malicious file in MS Word.
Microsoft Office XP Service Pack 3
Microsoft Office 2003 Service Pack 3
Microsoft Office 2007 Service Pack 2
Microsoft Office 2004 for Mac
Microsoft Office 2008 for Mac
Open XML File Format Converter for Mac
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the update released by the vendor: