Windows 7 Update appears to be compromised?

Technically, if you wanted to insert malicious software into an update that is signed, one way do it might be to find a nonsense piece of text that - when hashed - appears to match an existing hash from other contents.

That's the reason MD5 is useless now - you can pad almost any data to make it have almost any MD5 that you like if you spend enough time.

But, I have to admit, it sounds more like corruption, junk, internal testing, a mistake, etc. than anything else.  But WE cannot be sure.  Only MS can provide that answer.  It wouldn't be unusual for a false-Microsoft-cert to be signed by some high-up certificate authority "for testing" which leaks out and allows someone to generate a valid, signed update with whatever they wanted in it.

This is true. Unfortunately, that system has indeed already been compromised at least once. http://www.wired.com/2012/06/flame-microsoft-certificate/ 

That's an inaccurate statement. Microsoft Update was not compromised; Flame used a man-in-the-middle attack and a bogus certificate.

Fun Fact: SuperAntiSpyware is junk.  I worked for the company that makes the software (support.com) and they have a division that provides over the phone PC Support.  That department is not allowed to use SuperAntiSpyware..  Their main antimalware is MalwareBytes 1.75...  I wouldn't recommend using a product that the parent company doesn't even put faith into.

It didn't get compromised. 

Don't panic: Microsoft mistakenly posted a 'test' Windows update patch | ZDNet:

http://www.zdnet.com/article/microsoft-accidentally-issued-a-test-windows-update-patch/

A Microsoft spokesperson confirmed Wednesday that it had "incorrectly published a test update" and is in the process of removing it.

Don't panic: Microsoft mistakenly posted a 'test' Windows update patch | ZDNet:

http://www.zdnet.com/article/microsoft-accidentally-issued-a-test-windows-update-patch/

A Microsoft spokesperson confirmed Wednesday that it had "incorrectly published a test update" and is in the process of removing it.