Inside the WMF backdoor
The WMF vulnerability stems from the fact that WMF supports the SetAbortProc API, which is the GDI call to set an abort procedure, that Windows expects abort procedure code to be stored directly in the SetAbortProc WMF record, and that Windows will invoke the procedure under certain conditions immediately after processing the record. Thus, if an attacker can get your computer to execute their WMF file through Internet Explorer or Outlook, for example, they can make your system execute arbitrary Windows commands, including downloading malicious applications and launching them.
At the Sysinternals blog.
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