This file is indexed.

/usr/lib/x86_64-linux-gnu/libKF5MessageViewer.so.5 is in libkf5messageviewer5 4:16.04.3-3~deb9u1.

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

It is a symlink to /usr/lib/x86_64-linux-gnu/libKF5MessageViewer.so.5.2.3