/usr/ is in ruby-pdf-inspector 1.2.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/pdf/
/usr/lib/ruby/vendor_ruby/pdf/inspector/
/usr/lib/ruby/vendor_ruby/pdf/inspector/extgstate.rb
/usr/lib/ruby/vendor_ruby/pdf/inspector/graphics.rb
/usr/lib/ruby/vendor_ruby/pdf/inspector/page.rb
/usr/lib/ruby/vendor_ruby/pdf/inspector/text.rb
/usr/lib/ruby/vendor_ruby/pdf/inspector/xobject.rb
/usr/lib/ruby/vendor_ruby/pdf/inspector.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-pdf-inspector/
/usr/share/doc/ruby-pdf-inspector/README.md
/usr/share/doc/ruby-pdf-inspector/changelog.Debian.gz
/usr/share/doc/ruby-pdf-inspector/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/pdf-inspector-1.2.1.gemspec