It is considered an overthrow run if a ball hits a wicket while the batsman is inside the popping crease and then the batsman runs. There have been at least four instances in Test cricket of eight runs being scored off a single ball.

Can a batsman run 5 runs without overthrow?

A "five" is possible, but usually arises from a mistake by the fielders, such as an overthrow. The batsman is never compelled to run and can deliberately play without attempting to score. This is known as running between the wickets.

Is overthrow extras in cricket?

In cricket, an overthrow (sometimes called a buzzer) is an additional run scored by a batsman as a result of the ball not being collected by a fielder in the centre, having been thrown in from the outfield. In theory there is therefore no limit to how many runs may be scored off a single ball.