The details were revealed in court documents released after Ayom Deng, 18, faced Melbourne Magistrates Court.
He was arrested in Melbourne's west, about 10am on Wednesday, over an alleged abduction near Keysborough Secondary College in Springvale South.
Police said a 17-year-old girl was entering the school when she was approached by a male about 8.30am on  Friday. He then allegedly forced her into a vehicle and fled.
Deng, who was on bail at the time, is alleged to have been driving the vehicle.
He faced court on late on Wednesday after being charged with abduction, kidnapping, false imprisonment and committing an indictable offence whilst on bail.
His defence lawyer said Deng had diagnosed PTSD, it was not his first time in custody and he was vulnerable due to his age and appearance.
He did not apply for bail and was remanded in custody to reappear for a committal mention on September 23.
Charge sheets released on Thursday reveal Deng is accused of five offences including abducting the girl "with intent on marrying ... without her consent".
He is also charged with unlawfully imprisoning her and detaining her "against her will" in the court documents.
Deng is further accused of driving on a highway without a driver's licence or permit allowing him to drive.
His co-accused, a 15-year-old boy, has been charged with abduction and will face a children's court at a later date.
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