The home of judge Ijaz ul Ahsan, was targeted first at 4:30 am and then again at 9 am.
Judge Ahsan was one of the five judges who disqualified Sharif in July last year after an investigation based on Panama Papers revelations showed that his children owned offshore companies and used them to buy flats in London.
Ahsan is currently overseeing the implementation of the Supreme Court verdict against Sharif, his family and former Finance Minister, Ishaq Dar.
“Police teams are seeking to arrest the attackers and the investigation is underway,” Punjab government spokesman, Malik Muhammad Ahmad Khan, said.
Sharif and his children, Maryam, Hussain and Hassan, as well as Ishaq Dar are on trial in front of the Islamabad-based National Accountability Court, NAB, since September. A ruling is expected in May.