IICC president Sirajuddin Qureshi said people behind such incidents cannot be treated as human beings.
More than 130 children were killed in the attack on Army Public School in Peshawar.
The Tehreek-i-Taliban Pakistan claimed responsibility and called it a revenge attack for army operations in North Waziristan.
Malala is herself a survivor of a similar attack when she was shot in the head by the Taliban in her native Pakistan two years ago.
She was attacked for taking up cudgels for girls' right to education. The 17-year-old activist, who now lives in Britain, was awarded the Nobel Prize this year for her global campaign on education.
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