Ethan Hoac walking with two friends in Melbourne's northwest on June 26, 2023 when a group of teens drove at him in a Volkswagen Tiguan, striking the younger boy.
Ethan was flung into the air and two teens jumped out of the Tiguan with machetes, running at the boy and stabbing him while he was on the ground.
He suffered 30 stab wounds and died on the way to hospital.
The driver of the car, who was 17 at the time, was on trial in the Victorian Supreme Court, accused of being complicit in the murder.
He never wielded a machete but crown prosecutor Erin Ramsey told jurors he had reached an agreement with the other teens to kill or seriously injure Ethan.
Ms Ramsey outlined to the jury the group's movements before Ethan's death, describing how they drove around Melbourne for several hours before buying an ice cream about 10.29pm.
After the attack, the teens drove to the Sydenham Tennis Club where they were shown on CCTV footage inspecting the vehicle for damage and re-enacting the stabbing motions.
The teen and one of his co-accused also purchased hot cakes from McDonalds at 5.44am before they returned to their respective homes.
Defence barrister Philip Dunn KC told the jury it was not disputed that his client was behind the wheel of the car or that he went to the various locations around the time of Ethan's death.
But Mr Dunn denied his client was complicit in the murder, saying the jury should have reasonable doubt as to his state of mind.
The 12 jurors retired to consider their verdict on Thursday after hearing two weeks of evidence.
They returned their guilty verdict late on Tuesday after four days of deliberations.
The teen looked straight ahead and bit his lip as the verdict was handed down.
He was remanded in custody to face a pre-sentence hearing at a later date.
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