/usr/share/applications/screensavers/xmatrix.desktop is in xscreensaver-data-extra 5.30-1+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=XMatrix
Exec=/usr/lib/xscreensaver/xmatrix -root
TryExec=/usr/lib/xscreensaver/xmatrix
Comment=Draws dropping characters similar to what is seen on the computer monitors in "The Matrix". See also "GLMatrix" for a 3D rendering of the similar effect that appeared in the movie's title sequence. Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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