/usr/share/doc/clamav-milter/README.gz is in clamav-milter 0.99.4+addedllvm-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/clamav-milter/../clamav-base/README.gz
/usr/share/doc/clamav-milter/../clamav-base/README.gz