I had the same problem and did discover that you can download it from the adobe website without it insisting on installing the yahoo toolbar. The auto update does give you yahoo though, and their photograph album software (gah).
Yahoo are only one of the idiots that do this, my son regularly fills IE with bogus toolbars from some of the games sites he visits but as we use firefox it isn't a problem, I just edit the registry every few weeks and dual boot linux and remove the DLL's.
Amusingly the M$ anti-spyware stuff does seem to stop a lot of this, particularly hijacking the home page with a referer URL.