The helicopter burst into flames as it crashed in Kendal district, said the news channel.
Television footage showed the burning wreckage of the aircraft, with thick black smoke billowing into the air.
However, there was no immediate confirmation from the army on the incident.
There were nine passengers aboard the helicopter, Kompas TV had reported on the incident.
The six injured passengers were evacuated to two hospitals in Kendal district, where the crash occurred, the report said.
"The helicopter was flying very low and getting lower until it crashed with a very loud sound," said Eka, a witness quoted by Kompas TV.
"Two passengers escaped before it crashed and after that there were three or four explosions.” - AP
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