Police reported that the officer stopped on Highway 11 near Osler around 4 a.m. on Oct. 27 after seeing a black Cadillac CTS sedan with no license plate parked on the side of the road.
When the officer activated their emergency lights, a suspect reportedly got out of the Cadillac and shot at the officer.
RCMP on Monday released a composite sketch of the suspect, who was described as a black man, about six feet tall with high cheekbones and a thin build.
The officer returned fire and then chased the suspect vehicle as it sped toward Saskatoon, according to a police media release.
Police urged people not to approach any vehicles or suspects matching the description of those involved in the Oct. 27 incident.
Anyone with information was asked to contact police at 310-RCMP or Crime Stoppers at 1-800-222-8477.