A 777 has a cruising altitude that is 10,000 ft above the SU25 maximum operating ceiling and that is with no weapons onboard.
Strike that, 20,000 feet.
"A piece of wreckage from the Malaysia Airlines jet downed over Ukraine is seen near Petropavlivka village, Donetsk region, eastern Ukraine Wednesday, July 23, 2014. Independent military analysts said Wednesday that the size, spread, shape and number of shrapnel impacts visible in an AP photograph of a piece of the wreckage all point to a missile system like the SA-11 Buk."
https://in.news.yahoo.com/lightbox/shrapnel-damage-on-malaysia-plane-consistent-with-missile-strike-1406049495-slideshow/piece-wreckage-malaysia-airlines-jet-downed-over-ukraine-photo-140308925.html
The BUK Missiles use a high explosive - fragmentation warhead. Probably contains steel balls.