"Out of envelope fof a MANPADS, end of discussion."
NTSB says the explosion happened at 13,700 feet.
US Department of State says "MANPADS can strike aircraft flying at altitudes up to approximately 15,000 feet".
http://www.state.gov/t/pm/rls/fs/53558.htm
State doesn't know what they're talking about--they can reach a maximum slant range of 15,000 feet, which ends up being about 10,000 feet of altitude in practice.