how to change a page size
how do I change a page size in PDF XI
how do I change a page size in PDF XI
This option is not available in Acrobat XI as a built-in feature. It is available in Acrobat DC, under the Preflight tool.
What you can do, though, is to use the Adobe PDF printer to print the file to a new paper size, but it will mean losing any form fields, comments, bookmarks, links, etc. that are in it.
Another option is to use a script, like this one I've developed, to scale the pages of the file: Custom-made Adobe Scripts: Acrobat -- Scale PDF Pages
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