The good news is the security breach requires you to actively interact with the infected file, and as a result, there are many things you can do to stay safe from this type of exploit.

• Always make sure your software is up to date by patching whenever a patch is made available. Adobe releases regular updates, and making sure you have your program patched can help keep you safe.
• Never trust file downloads from emails you don't recognize or click on links to sites you aren't 100 percent sure about. Err on the side of caution.
• If you don't have one, pick up an authenticator for your account to add an extra layer of security to your Battle.net accounts. Authenticators come as a keyfob for a small price or in a mobile version for free.
• Run a PDF and flash blocker such as NoScript or enable secured browsing features in your preferred browser's settings.
• Surf with caution -- remember, even the most cautious of people can still get hacked by accidentally downloading a keylogger by visiting the wrong site or clicking the wrong link. Make sure you are protected with trusted anti-virus and anti-spyware software. Be sure that your protection is up to date, and actively run scans. Having the latest security definitions goes a long way to keeping these types of exploits from being possible.