This file is indexed.

/etc/pam.d/other is in libpam-runtime 1.1.3-7ubuntu2.3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# /etc/pam.d/other - specify the PAM fallback behaviour
#
# Note that this file is used for any unspecified service; for example
#if /etc/pam.d/cron  specifies no session modules but cron calls
#pam_open_session, the session module out of /etc/pam.d/other is
#used.  If you really want nothing to happen then use pam_permit.so or
#pam_deny.so as appropriate.

# We fall back to the system default in /etc/pam.d/common-*
# 

@include common-auth
@include common-account
@include common-password
@include common-session