perldoc PDF::Create

- 'MediaBox' Rectangle specifying the natural size of the page, for example the dimensions of an A4 sheet of paper. The coordinates are measured in default user space units. It must be the reference of a 4 values array. You can use get_page_size to get the size of standard paper sizes. get_page_size knows about A0-A6, A4L (landscape), Letter, Legal, Broadsheet, Ledger, Tabloid, Executive and 36x36.