
AI can be used to exploit a smart contract which has happened quite frequently recently, it wouldn't stop at just manipulating but it's very well capable of doing all those things you mentioned.
If you carefully observe latest news about MEV jaredfromsubway.eth and how hackers could drain $15M with fake token setup, the hacker might be using AI to analyze the weak point.
But it's hard to tell which attack is using AI because hacker don't tell, but manipulating crypto is very well within the capability of an AI agents hence it's not possibility anymore, it's real.
I think it is important to note that the packed ones are not, like stuff like chatgpt or claude or gemini or even maybe grok (not sure about grok) would not hack and help you steal money.
Most of the time, if there is a hacking with any AI then it is usually based on a customized AI that people used the basis of some other one, like open source, but built something on top of that themselves and this is basically just machine learning, if you put enough time and hours into it, it will learn to do whatever you ask it to, in this case hacking.