Illustrator PDF Margin Adjustment

I have a 22-page Adobe Illustrator document that is currently exported as a PDF. I simply need an extra 10 mm of white space added on every side of every page. Please do not scale or move the existing artwork—just extend the artboard and page bounds so the content sits inside the new margins exactly as it does now.

I will share a brief template that shows the correct page size with the 10 mm safety area; you can follow that as a visual guide. No additional layout tweaks, colour changes, or text edits are required.

Deliverables
• Updated .ai file for all 22 pages, reflecting the new 10 mm margin on all sides
• Press-ready PDF with pages in the same order and resolution as the original

I’m looking for someone comfortable working inside Illustrator who can turn this around quickly and double-check that every page matches the template before sending it back.