Exporting PDF - space between pages - can it be altered??

Hello All, 

Just maybe there is an Adobe PDF wizard out there in the aethers that knows the answer here. I'm exporting a screen resolution PDF from Illustrator, nothing particular rather standard. I'm using artboards for about a dozen pages. Once the PDF is exported and I open it up in Chrome or Acrobat, the pages in the PDF appear quite close together. Well, closer than I would like them to be. 

Perhaps this is just how PDFs are, but maybe the spacing can be controlled, you never know... or maybe YOU do... the mystery continues...