[quote=@Azkott]
I would probably agree on a saboteur, as it is incredibly hard for any one thing to knock a star destroyer of that size out of the sky. Maybe he/she would destroy the engines whilst in hyperspace, sending the vessel careening into a planet, etc. 
[/quote]

I'm not a science or lore junkie but I have a feeling that if someone blew the engines in hyperspace, we'd have much larger issues than landing on a planet (assuming we even do). I find it that there is a far greater chance of either people just getting sucked into hyperspace doing all sorts of fuckery to their bodies or the entire ship more or less exploding with almost no survivors as we'd all be in space and escape pods in hyperspace seems like a very bad idea.

Also, depending on the circumstances and factors, a SSD careening into a planet again has a high probably of killing just about everyone on board or just exploding outright especially if there was hyperspace engine damage.

Just my thoughts.