What you have there looks to me like a "light leak". This effect duplicates what can happen when film receives additional, unintended light exposure due to a hole or other small flaw in the camera body.
A google search for "light leaks" will give you a variety of resources for these effects. One I use can be found at lightleaklove.com. It is free and can be used simply as an overlay right on the Premiere Pro timeline.
Dell Precision T7600 (x2)
Win 7 64-bit
Adobe CC 2014 (as of 7/2015)
256GB SSD system drive
4 internal media drives RAID 5
Typically cutting short form from HD MP4 and P2 MXF.