If you have Adobe Reader 7 or earlier make sure you turn off the option "Display PDF in browser". Follow these three simple steps to turn it off.
- Start Adobe Reader
- Goto Edit > Preferences or press Ctrl + "K"
- Select Internet in Categories
- Make sure that the Display PDF in browser is unchecked.
Make sure you follow these steps as soon as possible or someone could be going through your personal information online. I have developed a proof of concept that can use the flaws in Adobe Reader to get information by only visiting a webpage. But I don't think I will release it online as it makes little sense to release it. It could be used to gain way too much private information from your browser. Make sure you turn it off before you end up loosing a lot of personal information.