This file is indexed.

/usr/sbin/update-grub-gfxpayload is in grub-gfxpayload-lists 0.7.

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
set -e

mkdir -p /boot/grub
for x in /usr/share/grub-gfxpayload-lists/blacklist/*; do
	case $x in
	    *~|*/\#*\#|*.dpkg-*)
		continue
		;;
	esac
	[ -e "$x" ] || continue
	cat "$x"
done >/boot/grub/gfxblacklist.txt.new
mv /boot/grub/gfxblacklist.txt.new /boot/grub/gfxblacklist.txt

exit 0