PDF Font Size Adjustment

I have an existing PDF that only needs one focused change: every bit of body text must be resized to a new, uniform font size. Nothing else in the document—images, margins, or overall layout—should move or distort. You may work directly inside the PDF editor of your choice, or rebuild the file in InDesign, Illustrator, or another layout tool if that guarantees cleaner results; whichever route you pick, I expect the finished pages to look identical to the original aside from the updated type size.

When the work is done, please give me the revised, print-ready PDF along with the editable source file so any future tweaks remain straightforward.