Quick Single Page PDF Edit

I need to revise a single-page PDF by inserting three to four short lines of text in the middle section of the page. Please match the existing font so the update feels native; if an exact match is impossible, keep one uniform font across the entire document.

Nothing else on the page should shift or lose quality, and the finished file must remain the same size and resolution as the original. Deliver the updated PDF plus the editable source (Illustrator, InDesign, or similar) so small future tweaks are easy.