This indicates an attack attempt to exploit a Buffer Overflow vulnerability in IBM Lotus iNotes.
The vulnerability, which is located in the "dwa85W.dll" ActiveX control, is due to an error when the application handles an overly long string passed to the Attachment_Times parameter. An attacker can trick an unsuspecting user into visiting a malicious webpage and execute arbitrary code within the context of the application.
IBM Lotus iNotes 8.5.3 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply patch available from the website.