That's a slightly strange thing for it to do. I googled for voicefive and opinions differ. Some people consider them involved with adware and others not (see e.g. http://nakedsecurity.sophos.com/2010/06/02/mac-osx-monitorware/).
I would recommend downloading the updater again from Adobe.com to make sure it hasn't been messed with. Don't download from anyone else offering it, of course, and double check it really is adobe.com - people impersonating legitimate download sites are on the increase.
Hmm, see also this:
Downloaded any free screensavers lately?
Yeah, I re-downloaded Adobe Reader, and no such problem re-occurred on checking-for-update.
Obviously, the old version had been messed-with.
And ..., no, I didn't download any screensavers, but I may have used my Photos on my Mac as screensavers.