Preview opening PDF files

In Finder, select one .pdf file. Click File > Get Info. Go to "Open with:" and change Preview to Acrobat. Click "Change All."
 
Additionally, there is a "Default Apps" preferences pane that can be installed to customize file associations. If it is not on your system already it can be downloaded from macupdate.com (my preferred download site). I am still an avid user of Quicktime Pro, so I use Default Apps to reassign all supported media files to Quicktime Pro 7.
 
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