Double clicking the container will open the file, provided you use the "store a reference" option to insert the filepath to the file rather than a physical copy of the file. On a networked database, this can require some extra work with your server settings as the filepath to the file's directory must be the same for all users and they must have at least read only access rights to the folder where the PDF files are kept.
Use Export Field Contents to export a copy of the file, but click the open automatically check box. This avoids the need to find and open the exported file after exporting it.
Write a script that uses Export Field contents to export and open the file. It's possible to specify a file path to the temporary items folder for this script so that you do not clutter up your computer with extra or out of date copies of the file.