Consecutive Paystub Salary Update while keeping in original pdf doc

I have a run of consecutive paystubs that must show a higher salary figure while keeping every other element—dates, hours, taxes, deductions, and formatting—exactly as they appear now. The revised PDFs... (Budget: $10 - $50 USD, Jobs: Adobe Acrobat, Data Entry, Editing, FileMaker, Pattern Matching, PDF, Website Design)