Trojan Java/Mesdeh

I update and do a full system scan everyday but Norton did not find this. I used Microsoft Safety One Scanner and it found a Trojan: Java/Mesdeh on my computer and said it was severe. It  was listed as c:\users\owner\appdata\locallow\sun\java\deployment\cache\6.0\15\2478564 f-34d34bbb  (aba7a760c0e) and then listed the same thing in documents.

!. How do I remove this?

2. Why didn't Norton pick this up? I use Norton Security Suite