/usr/share/cups/mime/pstotiff.convs is in hplip 3.14.6-1+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | # Copyright 2010 by HP.
#
########################################################################
#
# Format of Lines:
#
# source/type destination/type cost filter
#
# General Notes:
#
# The "cost" field is used to find the least costly filters to run
# when converting a job file to a printable format.
#
# All filters *must* accept the standard command-line arguments
# (job-id, user, title, copies, options, [filename or stdin]) to
# work with CUPS.
#
########################################################################
#
# TIFF filters...
#
application/postscript image/tiff 80 pstotiff
application/pdf image/tiff 80 pstotiff
application/vnd.cups-pdf image/tiff 80 pstotiff
application/vnd.cups-postscript image/tiff 80 pstotiff
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