The win gives the three-time champion an early boost in its title defence and it next takes on Afghanistan on Sunday, while Indonesia will aim to bounce back against the United Arab Emirates.
Ketut Sudiartawan (own goal), Mehdi Shirmohammadi (three goals), Mohammad Mokhtari (two goals), Mohammad Masoumizadeh, Mehdi Mirjalili, Movahed Mohammadpour, Mohammad Ali Nazarzadeh, Mohammad Dastan and Ali Mirshekari were on target for Iran.
Made Adhi Kurniawan scored for Indonesia.