Here is a program to invert a PBM file, as a workaround to subject bug.
Compilation: 
gcc -o pbminvert pbminvert.c
Execution:
cat file_to_be_inverted.pbm | ./pbminvert > inverted_file.pbm

** Attachment added: "pbminvert.c"
   http://launchpadlibrarian.net/9888568/pbminvert.c

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pdfimages produces inverted image for black & white image
https://bugs.launchpad.net/bugs/134313
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