Tilman,
I've uploaded the three screen-shots.
https://www.imgload.org/image/5I2NPhttps://www.imgload.org/image/5IXJUhttps://www.imgload.org/image/5IcLx
I've no problem moving to the latest release of PDFBox, but the
problem has only occurred in three files. It could be months before I
see the problem again.

CheersFrancis

        -----------------------------------------From: "Tilman Hausherr" 
To: users@pdfbox.apache.org
Cc: 
Sent: Monday September 23 2019 3:29:49PM
Subject: Re: Rogue characters corrupting AcroForm object

Hi,

 The current version is 2.0.17. Please retry with that one and upload 
 screenshots and PDF on a sharehoster.

 Tilman

 Am 23.09.2019 um 21:09 schrieb francisgra...@ca.rr.com:
 > Hi,
 >
 > I've used PDFBox (2.0.7) to develop an interactive PDF document.
 > When complete, the user uploads the PDF to an app server.
 >
 > In the many hundreds that have been successfully filled-out and 
 > uploaded, I have had three instances where a rogue character has 
 > corrupted the AcroForm object causing the upload to fail.
 >
 > In two cases the rogue character is in the structure of the
AcroForm 
 > object, such that I cannot read data from that line of the object.
 >
 > The other time, the rogue character was appended into a data value
of 
 > the AcroForm object.
 > Although I could read the data value, it was not the value that I 
 > wrote out when creating the PDF file.
 >
 > I have attached three screen-shots showing the rogue characters.
 >
 > Has anyone else experienced the same issue?
 > I've looked through the web and not found anything similar.
 >
 > I'm confident that the rogue characters were not there when the
file 
 > was created.
 > It is though they are put there while the user interacts with the
PDF.
 > The user may open and close the file multiple times before upload.
 >
 > Cheers
 > Francis
 >
 >
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