This indicates an attack attempt to exploit a remote Code Execution vulnerability in Microsoft XML Core Services.
The vulnerability is due to an error when the vulnerable software attempts to calculate dynamic pointers' addresses. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application.
Microsoft XML Core Services 4.0
Microsoft XML Core Services 5.0
Microsoft XML Core Services 6.0
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.