This file is indexed.

/usr/share/initramfs-tools/hooks/nbd is in nbd-client 1:3.8-4+deb8u3.

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

# We don't have any prerequirements
case $1 in
prereqs)
	exit 0
	;;
esac

. /usr/share/initramfs-tools/hook-functions

manual_add_modules nbd
auto_add_modules net
copy_exec /sbin/nbd-client /sbin