/usr/lib/libpfq_postfix1.so is in libpfqueue-dev 0.5.6-9build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libpfq_postfix1.so.0.0.0
/usr/lib/libpfq_postfix1.so.0.0.0