/usr/share/applications/screensavers/attraction.desktop is in xscreensaver-data-extra 5.36-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=Attraction
Exec=/usr/lib/xscreensaver/attraction -root
TryExec=/usr/lib/xscreensaver/attraction
Comment=Uses a simple simple motion model to generate many different display modes. The control points attract each other up to a certain distance, and then begin to repel each other. The attraction/repulsion is proportional to the distance between any two particles, similar to the strong and weak nuclear forces. Written by Jamie Zawinski and John Pezaris.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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