This indicates an attack attempt against a buffer-overflow vulnerability in Microsoft Office.
The vulnerability is caused by an error when the vulnerable software handles a malformed FlashPix image file. It allows remote attackers to execute arbitrary code on vulnerable systems via sending a FlashPix image file.
Microsoft Office XP Service Pack 3
Microsoft Office Converter Pack
System Compromise: Remote attackers can gain control of vulnerable systems.
Refer to the vendor's website for the suggested workaround: