/usr/bin/pdf180 is in pdfjam 2.05-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
##
## pdf180: A shell program to rotate pages of PDF files
##
## Author David Firth (http://go.warwick.ac.uk/dfirth)
##
## This is a simple wrapper for pdfjam, version 2.05
##
exec pdfjam --suffix rotated180 --angle 180 --fitpaper true "$@"
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