postrm is in xrdp-pulseaudio-installer 0.9.5-2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
set -e
rm -rf /var/lib/xrdp-pulseaudio-installer
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