Naturally, that isn't Flash, it's malware. You can be certain that it is designed to infect Windows boxes, but it isn't known if it can also detect a Mac and serve malware just for us. We do know that there are some weaknesses in OSX and Safari that CAN be exploited, but not if this is one of them.
Bottom line: It's spam. Don't click it. I don't care how pretty or believable it looks. It is always out to hurt you so avoid it at all costs.