There was a massive security breach of Adobe accounts, affecting as many as 150 million users. If you have or ever had any Adobe account (including Adobe Reader, Photoshop, Acrobat or Cold Fusion, you should change your password. Even if you don't remember ever opening an account, a password reset is a wise thing to do.
Explanatory Link: https://blog.lookout.com/blog/2013/11/12/security-alert-adobe-password-breach/
Password Reset Link: https://lastpass.com/adobe/