/usr/share/dbus-1/services/org.mate.atril.Daemon.service is in atril 1.16.1-2+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=org.mate.atril.Daemon
Exec=/usr/lib/atril/atrild
|