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Solution: Fix in Adobe Acrobat.
Mac users:
SeeSee How to change the size of a PDF page using Acrobat Preflight tool on Mac.
PC users: Follow the instructions below. Note that these instructions are for Adobe Acrobat Pro 2017.
Instructions
Go to Tools > Protect & Standardize > Print Production
Select Preflight from menu in right-hand sidebar
Click on "Select Single Fixups" icon (see image below)
Select "Pages" to expand menu, and then "Scale pages to specified size" (see image below). Select "Edit."
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5. Enter desired page measurements under "Scale pages." See image below. For a standard 8.5 x 11 document in "Portrait" format, this will be:
Short edge: <shortedge:8.5>
Long edge: <longedge:11>
Click OK.
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6. Click "Fix." A new window should pop up. Click OK there too.
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