This file is indexed.

/etc/pam.d/atd is in at 3.1.20-3.1ubuntu2.

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

The actual contents of the file can be viewed below.

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#
# The PAM configuration file for the at daemon
#

@include common-auth
@include common-account
session    required   pam_loginuid.so
@include common-session-noninteractive
session    required   pam_limits.so
auth	required	pam_env.so user_readenv=1