Corrupt office, pdf, and other general use files

[Robert.Yung () L-3com com]

List, hope you can help.

It has become apparent that a user may have installed malware which has
randomly gone through an entire drive and corrupted pdf, doc, xls, and
other general use office files.  When an attempt is made to open a
corrupted file, Word (for example) will error out and say that the file
is not readable.

Question is, does anyone know of a tool that will traverse an entire
directory structure and check files of commonly known formats and report
back to say whether or not they are corrupt?  I need a way to identify
how widespread the problem is and see if there is a pattern to which
files are corrupted.  The tool does not need to fix the file, I just
require a report.

Thanks in advance!