Corrupt Office Documents

Published: 2019-12-28
Last Updated: 2019-12-28 17:38:58 UTC
by Didier Stevens (Version: 1)
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My tool to analyze CFBF files,, is not only used to analyze malicious Office documents.

Over the years, a couple of users reached out to me informing me that they were able to recover their VBA code from corrupt Word or Excel documents with my tool.

Although Word or Excel is no longer able to open/repair the corrupted document, the stream(s) with VBA code can remain intact, and parsed with to extract the VBA source code.

When finds streams with VBA code, but is not able to completely extract the VBA source code, an E indicator will be used to mark the stream (in stead of M/m).

Like in this example:

When this happens, option -v can not be used to extract and decompress the VBA source code:

But you can try another option, --vbadecompresscorrupt, to try a partial recover of the VBA source code:

Remark that this will not always work, it depends on the type of corruption.



Didier Stevens
Senior handler
Microsoft MVP

Keywords: corrupt office vba
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