You can't know that, as I can't know!
No hack it's safe that's definelly!
But I know something 100% sure, VAC doesn't instantly bans you! (happened to me in MW2), it gives you a period, if you continue to hack, you are banned, if you stop you might be lucky!
I used frequently a hack = ban, one mate of mine used it to 3-4 times, and he his not banned! (same period), we haven't used and Vac disablers.