Yesss, you definately need to take precautions for malaria, no matter if you are short or long term in that area.
I have been in Aceh in a professional manner for a longer period of time and although all of our team were taking medication, one of my collegues got ill and eventually had to be airlifted to Singapore for blood transfusion (but that was worst case scenario). Not to make you scared or anything, but it takes just one nasty mosquito to land into trouble.
Start taking them well before you arrive. Remember there are no medical services of any western standards at all in the whole province. Have a nice trip.