/usr/lib/x86_64-linux-gnu/libCOS4.so.2

This file is indexed.

/usr/lib/x86_64-linux-gnu/libCOS4.so.2 is in libcos4-2 4.2.2-0.8.

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

It is a symlink to /usr/lib/x86_64-linux-gnu/libCOS4.so.2.2