Hi, I don't use Acrobat either but did you never use a google search term like 'uninstall acrobat mac' ? I just did and at least one of the hits is from adobes own website.
Is there a prefpane in System Prefs or your browser prefs that handles the web plug in.
It may be necessary to go to Adobe's website to find an uninstaller.
Preview should automatically take over the job.
I don't have Acrobat and have no problems so far.
I removed it about six months ago when it's major vulnerabilities to malware were pointed out.
Never follow links from pop-ups that say you need a new version of Acrobat, Flash or other software (video codecs are a favourite) as they stand a high chance of being re-directs to malware sites.
Always check the latest versions from your own bookmarks to the vendor sites.