Detecting empty office doc containing virus macro

[Gary Stainburn <gary@xxxxxxxxxxxxxx>]

We are receiving LOTS of emails that contain empty XLS or DOC documents with 
embedded virus macros.  These are getting past SPAMASSASSIN, Clamav and 
Kaspersky.

I'm trying to write a filter for EXIM to block these emails but I need to know 
a good, quick, command-line to detect an empty doc with a macro.

Is there anything available that I can use??

I have managed to write a PERL script to detect empty xls xlsx, doc and docx 
files but I cannot detect whether they have any macros embedded

Gary
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