Author Topic: Hiding a PDF document  (Read 1919 times)

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November 10, 2009, 04:43:03 pm
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SysAdMini

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http://blog.didierstevens.com/2009/11/09/quickpost-hiding-a-pdf-document/

Quote
Here’s some Python code (it uses my mPDF module) to append a new PDF document to an existing PDF document to “hide” the original document. Recovering the original is trivial, you open the PDF document with a HEX-editor and delete the appended document (starting after the second %%EOF counting from the end of the file). This trick uses incremental updates.
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