I don't know about Mitsubishis, but Toyotas use rubber stripping which can be tucked back into a groove. Yours looks to be that same way. Is the rubber torn, or just pulled out? Take a close look at it, and see if it might just tuck back in without having to replace it. If it's not tucked completely in, it can come out again, or if the rubber is damaged or if the door frame is bent, you'd have to either replace the rubber, or glue it in with black silicone rubber adhesive. NOTE: A little goes a LONG way. Just a dot of silicone rubber every 5 or 6 cm should do the trick. If you get it smeared on the paint or glass, wipe it off with a dry paper towel. Don't apply the dots of silicone until you have made sure that you can fit the rubber exactly right, as it will be very messy if you have to try to fit it more than once, after the silicone is on the door frame. After you have done it, carefully wrap a few loops of blue painters tape around the rubber to secure it in place for a day.
Charles