/usr/share/doc/debian/FAQ/debian-faq.pdf.gz is in debian-faq 5.0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/debian/FAQ/debian-faq.en.pdf.gz
/usr/share/doc/debian/FAQ/debian-faq.en.pdf.gz