magic(5) on FreeBSD
The text 1f825bcb3b2d, as FreeBSD 10.0-RELEASE, FreeBSD 9.3-RELEASE, FreeBSD 9.2-RELEASE, FreeBSD 9.1-RELEASE shipped it.
file command's magic pattern file
The text 1f825bcb3b2d, as FreeBSD 10.0-RELEASE, FreeBSD 9.3-RELEASE, FreeBSD 9.2-RELEASE, FreeBSD 9.1-RELEASE shipped it.
file command's magic pattern file