Make sure your internet browser, and PDF reader (Adobe Acrobat or Adobe Reader) are updated to the most current version to limit attacks from malicious PDF files. A recent report indicates that more and more hackers are exploiting security issues in PDF readers.
Part of the reason hackers exploit Adobe products is that countless numbers of users operate outdated versions of the software that is more prone to attacks. The sheer number of individuals using an Adobe product is another reason Adobe is targeted.
To minimize the risk, make sure your browser and any plugins you use to read PDFs are up to date. You should also verify your security settings in your browser to make sure you have a high level of security. Lastly, make sure any Adobe applications are fully updated.
Make sure you are operating the most secure system possible to prevent a crippling computer meltdown.