On 22 July 2011 an Airbus A340-300 being operated by Air France on a scheduled passenger flight from Caracas to Paris CDG at FL350 in night IMC encountered moderate turbulence which led to an overspeed annunciation which was followed by the aircraft abruptly pitching up and a gain of over 3000 feet in less than a minute before it was returned to the previous cruise level. There were no injuries to any of the 284 occcupants. It appears that the relief First Officer was not present in the flight deck during the event.