This is from the page Apple has up on it. Looks pretty harmless.

Resolution
How to avoid installing this malware

If any notifications about viruses or security software appear, quit Safari or any other browser that you are using. If a normal attempt at quitting the browser doesn’t work, then Force Quit the browser.

In some cases, your browser may automatically download and launch the installer for this malicious software. If this happens, cancel the installation process; do not enter your administrator password. Delete the installer immediately using the steps below.

Go into the Downloads folder or your preferred download location.
Drag the installer to the Trash.
Empty the Trash.

http://support.apple.com/kb/ht4650

The very worst it will do is install a program that tells you you have a virus and it needs your credit card to continue. Anyone who'd fall for a phish this obvious deserves it.

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