This indicates an attack attempt against a remote code-execution vulnerability in Microsoft Access.
The vulnerability is due to an error when the vulnerable software instantiates three specific ActiveX controls in a particular order. A remote attacker may exploit this to execute arbitrary code.
Microsoft Office Access 2003 Service Pack 3
Microsoft Office Access 2007 Service Pack 2
Microsoft Office Access 2007 Service Pack 1
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the patch supplied by the vendor: