How can I know my Mac is not "hacked" by malware

Opening a Safari window recently I got a message from an unknown source that somebodu wanted to become my sexbuddy. I was supposed to OK it which of course I didn't . Meanwhile all my functions in Safari were frozen. The only thing that worked was a force quit from the Apple menu. The following days the same happened every time I opened Safari. I even reinstalled Maverick hoping to get rid of the thing but that didn't seem to help. Finally it disappeared, I guess when I succeeded in stopping Safari to open with the most recent window.
However I am not absolutely certain my Mac is clean and not hacked by somme vilain through some malware. How can I be sure?
Tha,ks for the help!

Anything coming via Safari is not malware but phishing attempts.
Helpful Links Regarding Malware Protection
An excellent link to read is Tom Reed's Mac Malware Guide.
Also, visit The XLab FAQs and read Detecting and avoiding malware and spyware.
See these Apple articles:
          Mac OS X Snow Leopard and malware detection
          OS X Lion- Protect your Mac from malware
          OS X Mountain Lion- Protect your Mac from malware
          About file quarantine in OS X
If you require anti-virus protection I recommend using VirusBarrier Express 1.1.6 or Dr.Web Light both from the App Store. They're both free, and since they're from the App Store, they won't destabilize the system. (Thank you to Thomas Reed for these recommendations.)

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How can I know my Mac is not "hacked" by malware

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