SSIS: Extract Part of file in SSIS

Hi guys - How do i extract the specific  ID from the filename in SSIS. I already have a variable which pulls filename and now i want to pull an ID from filename. 

Filename: Card Already Issued 147_147_72508_20190712070510.pdf

I want pull the value in between second "_" and third "_".

I want to pull 72508. 

Thanks for your help.