And what does this have to do with InDesign? You're asking this in the InDesign User Forum.
I believe it's related to the document set up and export to print set up in indesign. This is a 50 pages document....can't be done in Illustrator. That's what I assumed.
But most likely the PDF was cropped using the cropping tool in Acrobat.
Let me know if I misunderstood you...I didn't use any tool in Acrobat or Reader to crop anything. It just look different in Adobe Reader and Illustrator.
The reason I asked this question is I am thinking I might be able to use this to generate one file for my group to review and for the print shop?
Right now I always generate two pdfs: one is regular document for review (without any marks) and one with all the marks for the print shop.
It needn't be you who did the cropping, I would guess there's actually someone intelligent enough at the place you downloaded to have done it so their customers don't need to see the marks. Other apps generally ignore cropping done inside Acrobat.
But your print shop is going to print from Acrobat, not Illustrator, so it won't help you.
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I agree with Peter Spier.
The PDF you downloaded, whatever program it was designed in, was probably opened in Acrobat Pro and the page boxes modified such as with the Crop tool in that program. See this info to better understand the crop, art, trim and bleed boxes, which are invisible boundaries defined in every PDF. These can be a bit challenging to understand at first, but they can be useful once they make sense.
I don't know of a way to control these boundaries (boxes) independently, from within InDesign. But by adjusting the margins (aka cropping) of the crop box using Acrobat, then Reader (and others) will usually* 'hide' information outside that boundary, whereas a program like Illustrator will always access all the information in the PDF, including objects outside the crop box.
*Note the setting in Acrobat/Reader to "Show art, trim & bleed boxes"!
I am not familiar with Acrobat so I would look into it. Learned a lot! Thank you so much! :-)