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PDFRider creates pdftk.exe in process folder - blocked by restriction policies
Various processes that are run are run via a copy of pdftk.exe that is copied into the source folder of the PDFs.
For networks where .exes are whitelisted (in their locations) or completely blocked from running in %appdata% (ransomware protections etc) this does not work.
I'm guessing the process called is "pdftk.exe 1.pdf 2.pdf" to save having to call the full file path multiple times, but this shouldn't really be a problem to do.