After two confirmed episodes of a scripted griefer object ("Christmas Gift") being dropped on residents by an avatar Duda Kamala, I have banned that person from the CDS sims. We've also filed the appropriate Linden Labs abuse reports, though the latter rarely provide any answer or resolution.
I hope this is obvious, but it's always best not to take. or rez, unknown objects from unknown avatars. It's an avoidable risk, similar to computer viruses embedded in strange e-mail messages.
Regards JP