What you'll find is that unless you send it funds it will actually do nothing at all (so won't waste anyone's resources beyond the actual AT creation tx data in the blockchain).

And even if you send it say 1M BURST it won't cause the next block minter to run out of memory (or get stuck forever) as the fixed maximum steps per AT will mean it won't spend more than a fraction of a second processing that (there is also a max. number of ATs that can be processed per block limit so you can't screw things up by creating 1M such ATs).

So any such "attack" would actually be less effective than just sending millions of "normal txs".