/usr/lib/x86_64-linux-gnu/libmx-1.0.so

This file is indexed.

/usr/lib/x86_64-linux-gnu/libmx-1.0.so is in libmx-dev 1.4.7-1+b1.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/x86_64-linux-gnu/libmx-1.0.so.2.405.0