7. and 8. flight tickets, reservations, activities, invitations but note : METV s are restricted to citizens or residents of the neighboring countries, in this instance Malaysia.
Like you mentioned, complete list on embassy's website. I also showed copy of flight in and out of TH. If you have a complete file as per their website it's fairly easy there.
You could get a 30 day extension at 1900 thb or pay the overstay fee @ 500 thb which for such a short period will not affect future travel as some have posted.