I have been getting warning emails about the same, and I guess there may be some amount of truth in them.
I received quite a few scraps from pals with this content. None of them know Portuguese.
The scrap was:
Opa, tudo bom? Eu criei um vídeo com uma seleção de minhas fotos novas, clica aí pra ver – http://mmgurl.com/M7U – Estão bem legais!!!
When I once tried to visit the link it asked me to download something (which I didn’t). Other time led me to a proxy server.
I wasn’t able to check if it actually was a virus, but I suggest not downloading any such file. Immediately delete the scrap if you are sure your friend doesn’t speak Portuguese, or if he/she doesn’t even know about the scrap.
I’m not sure how the scraps actually get placed. Possible computer infection? Or a problem with the Orkut server? Or is it a hoax?