This file is indexed.

prerm is in libpam-cracklib 1.1.8-3.1+deb8u2+b1.

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.

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#!/bin/sh

set -e

if [ "$1" = remove ] && [ "${DPKG_MAINTSCRIPT_PACKAGE_REFCOUNT:-1}" = 1 ]; then
	pam-auth-update --package --remove cracklib
fi