/usr/share/pam-configs/edu-group is in debian-edu-config 1.818+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 | Name: Group membership granted at login (Debian Edu version)
Default: yes
Priority: 0
Auth-Type: Additional
Session-Interactive-Only: yes
Auth:
optional pam_group.so
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