/usr/share/doc/libjs-rainbow/ is in libjs-rainbow 1.1.8+ds1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libjs-rainbow/README.Debian
/usr/share/doc/libjs-rainbow/README.md
/usr/share/doc/libjs-rainbow/changelog.Debian.gz
/usr/share/doc/libjs-rainbow/copyright
/usr/share/doc/libjs-rainbow/examples/
/usr/share/doc/libjs-rainbow/examples/c.html
/usr/share/doc/libjs-rainbow/examples/css.html
/usr/share/doc/libjs-rainbow/examples/html.html
/usr/share/doc/libjs-rainbow/examples/index.html
/usr/share/doc/libjs-rainbow/examples/js.html
/usr/share/doc/libjs-rainbow/examples/php-long.html
/usr/share/doc/libjs-rainbow/examples/php.html
/usr/share/doc/libjs-rainbow/examples/python.html
/usr/share/doc/libjs-rainbow/examples/ruby-test.html
/usr/share/doc/libjs-rainbow/examples/ruby.html
/usr/share/doc/libjs-rainbow/examples/shell.html
/usr/share/doc/libjs-rainbow/examples/themes/
/usr/share/doc/libjs-rainbow/examples/themes/all-hallows-eve.css
/usr/share/doc/libjs-rainbow/examples/themes/blackboard.css
/usr/share/doc/libjs-rainbow/examples/themes/github.css
/usr/share/doc/libjs-rainbow/examples/themes/tricolore.css
/usr/share/doc/libjs-rainbow/examples/themes/twilight.css
/usr/share/doc/libjs-rainbow/examples/themes/zenburnesque.css