/etc/apt/apt.conf.d/70paxrat is in paxrat 1.32.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
DPkg::Post-Invoke { "/usr/bin/test -x /sbin/paxrat && /sbin/paxrat 1>/dev/null || true";}