This indicates an attempt to exploit a remote Code Execution vulnerability in Windows.
The vulnerability is caused by the way the vulnerable application launches "packager.exe". A remote attacker can exploit it to load and execute a malicious executable file.
Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor: