/usr/lib/mime/packages/xpdf is in xpdf 3.03-17+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | application/pdf; /usr/bin/xpdf %s; test=test "$DISPLAY" != ""; description=Portable Document Format; nametemplate=%s.pdf; priority=6
application/x-pdf; /usr/bin/xpdf %s; test=test "$DISPLAY" != ""; description=Portable Document Format; nametemplate=%s.pdf; priority=6
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