Hello,

Reading a PDF File based on COS Objects will teach you *a lot* about PDF 
Internals. There are some tools out there to do that or you can write 
your own.... I used to have a plug-in to do that but I've mislaid the 
source and it no longer works with the later versions of Acrobat :-(

Regards, Andrew

On 14/03/2013 12:04, mkl wrote:
> adriano,
>
> adriano wrote
>> I think we are starting to converge to a common understanding of my point!
>> :)
> Well, you want to analyze all data in a PDF file, be it reachable from the
> root or not. This can be a valid requirement, e.g. for repairing files with
> broken cross references or for analyzing the history of individual
> documents. I don't understand, though, the need for this analysis merely to
> find 'suspicious' objects (especially as your examples for such suspicious
> object in general are not suspicious at all) without further motivation.
>
> That been said, it of course is possible to try to read a PDF with no
> consideration given to the cross references. As far as I know PDFBox has a
> mode for reading PDFs like this (the other mode --- using the coss
> references --- seems to be the more endorsed one nowerdays, though); it has
> to choose if it finds multiple objects with the same object and generation
> number. Thus, you might want to take that code as a start and instead of
> chosing implement some comparison.
>
> Regards,   Michael
>
>
>
> --
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