"malicious LLM" is just a bunch of weights. It runs on, say, Llama.cpp as regular user in separate account, often on its own hardware.
"malicious LLM output" is just a Markdown formatted Unicode-encoded text, produced by Llama.cpp and printed on the screen by my python API script.
I control the input.
Let's assume that "rogue LLM weights" from HF produce "rm -Rf" instruction. it never gets to shell.
And how that "malicious LLM" will disrupt and hack me? With swear words and em—dashes? :-)
(Adding this philosophical point: Black.Mirror.S07E04.Plaything is probably the closest scenario to what you are describing?)
(Adding this philosophical point: Black.Mirror.S07E04.Plaything is probably the closest scenario to what you are describing?)