This indicates an attack attempt to exploit a remote code-execution vulnerability in Microsoft Office products.
This vulnerability is caused by the application's failure to examine invalid Object Records before processing them. A remote attacker may exploit this to execute arbitrary code.
Microsoft Office 2000 Service Pack 3
Microsoft Office XP Service Pack 3
Microsoft Office 2003 Service Pack 3
2007 Microsoft Office System and its Service Pack 1
Microsoft Office Excel Viewer 2003 and its Service Pack 3
Microsoft Office Excel Viewer
Microsoft Office for Mac
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 patch, available at the following website: