The sample PDF provided has a /UserUnit key with the value 3 in the
Page dictionary. This key was introduced in PDF 1.6 and is described
in various specifications along the lines of "(Optional; PDF 1.6) A
positive number giving the size of default user space units, in
multiples of 1 ⁄ 72 inch." so it is a scaling factor on default user
space. So, based on what you have reported, Acrobat is entirely
correct and confirmed by other tooling.

Peter
ISO 32000 co-Project Leader

On Wed, Dec 11, 2019 at 10:13 AM Gilad Denneboom
<gilad.denneb...@gmail.com> wrote:
>
> Hi all,
>
> This issue really stumps me. I'm getting different page box values between
> PDFBox and Acrobat, and even within Acrobat itself...
> The files I'm working with are very large housing plans.
> When I open them in Acrobat it reports the page size to be 35.93 x 435.20
> inches, but when I use a script I get different results, namely 11.97 x
> 145.06 inches, which is also what I'm getting when I use PDFBox 2.0.16. It
> seems the difference is exactly 1/3, ie the page boxes reported by Acrobat
> are 3 times as large as those PDFBox and the script find. The same is true
> of all boxes (Crop, Trim, Bleed, Art, etc.).
> I think the results reported by Acrobat are the correct ones, but I can't
> figure out where they're coming from... Any insight would be very much
> appreciated.
>
> A sample file can be found here:
> https://drive.google.com/open?id=1FeFs1W0Iesz6Kcq3wTU_LclyIgmFBOsF
>
> Thanks in advance!

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