This indicates an attack attempt to exploit a Memory Corruption vulnerability in Microsoft Internet Explorer.
The vulnerability is due to an error when the vulnerable software handles a crafted object. An attacker can exploit this by tricking an unsuspecting user into visiting a malicious webpage and execute arbitrary code within the context of the application.
Microsoft Internet Explorer 6
Microsoft Internet Explorer 7
Microsoft Internet Explorer 8
Microsoft Internet Explorer 9
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.