How to connect UCM content ID on performance review PDF download to employee?

Summary: We have a mass download of performance review PDFs from 10 years and need to categorize these documents. We have the UCM pdf downloads, but can't figure out how to tie these back to the employee.

Example ID file name from output: UCMFA04773291-9410237_4706330_UCMFA04773291~1_pdf.pdf

How can we correctly categorize and store over 80,000 of these pdfs?

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Code Snippet (add any code snippets that support your topic, if applicable):