Police say masked assailants broke windows and threw a Molotov cocktail at the office of Kosovo's president but failed to set fire to the building.
No one claimed responsibility for attack in the early morning of March 12 in the center of the capital Pristina that the government condemned as "dangerous for the constitutional order and the country's stability."
Kosovo is facing a political crisis, with the opposition denouncing an EU-brokered deal with Serbia to give more rights to local Serbs.
The office was empty at the time and no one was injured.
Part of a wall facing a busy road was blackened by smoke from the burning device.
Police were working to identify a white car they suspected was used by the assailants.
The office is used by outgoing President Atifete Jahjaga and will be taken over by newly elected President Hashim Thaci next month.