In large saucepan, combine corn syrup, sugar, brown sugar and peanut butter.
Bring to boil over low heat, stirring constantly; boil 2-3 minutes. Remove saucepan from heat.
In large bowl, combine raisins and popcorn; pour hot mixture over popcorn and toss carefully with wooden spoons until well-coated.
Spray 9-by-13-inch baking dish with cooking spray; press popcorn mixture into pan and cool completely. Cut into 12 squares and serve.