This file is indexed.

/usr/share/Crack/scripts/fbfilt is in crack-common 5.0a-9.3.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
###
# This program was written by and is copyright Alec Muffett 1991,
# 1992, 1993, 1994, 1995, and 1996, and is provided as part of the
# Crack v5.0 Password Cracking package.
#
# The copyright holder disclaims all responsibility or liability with
# respect to its usage or its effect upon hardware or computer
# systems, and maintains copyright as set out in the "LICENCE"
# document which accompanies distributions of Crack v5.0 and upwards.
###

opfile="$1"
mfile="$2"

if [ "x$1" = "x" ]
then
	echo "Usage: $0 output-file [mailfile]" 1>&2
	exit 1
fi

awk -F: '
BEGIN {
	opfile ="'"$opfile"'"
	mfile ="'"$mfile"'"
}
$1 == "F" {
	pw[$2] = $3
	next
}
$1 == "E" {
	print $0 > opfile
	next
}
$1 == "D" && pw[$3] != "" {
	print $0 > opfile
	print "G:0:" $3 ":" pw[$3] > opfile
	if (mfile != "")
	{
		print "nastygram", $4 > mfile
	}
	next
}
$1 == "D" && $3 == "" {
	print $0 > opfile
	print "G:0:" $3 ":<no-ciphertext>" > opfile
	# lets let the sysadmin find these
	next
}
{
	print
}'