This indicates an attack attempt against a buffer overflow vulnerability in Microsoft Office PowerPoint.
The vulnerability is caused by an error when the vulnerable software is handling a malformed ".ppt" file name. It may allow remote attackers to execute arbitrary code by sending a crafted PPT(.ppt) file.
Microsoft Office PowerPoint 2002 Service Pack 3
System Compromise: Remote attackers can gain control of vulnerable systems.
Refer to the vendor's web site for suggested workaround.