/usr/share/php/tests/Horde_Mime/Horde/Mime/fixtures/header_trailing_ws.txt is in php-horde-mime 2.2.8-1.
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 | Subject: This subject has a trailing whitespace
From: "Test User" <test@example.com>
Body Text.
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