Scanning always produces invalid PDF files

I recently purchased an HP OfficeJet 4636, and I notice that when scanning documents to PDF, the generated PDF files are always invalid. When opening these files in Acrobat Reader or Acrobat Pro, one gets the message "The file is damaged but is being repaired." Many other PDF tools can't open the files at all.
I have installed the newest firmware update and restarted the printer, but the problem was not solved.
I tried many different settings (e.g., resolution, paper size, scan from ADF, scan from Glass), but the problem is always the same. For the record, I am using the "Web scan" interface: http://XX.XX.XX.XX/#hId-pgWebScan.
If there were an opportunity to attach a file to this bug report, I would attach an actual PDF file generated by this printer. I am happy to supply the file later, and I will refer to this specific file in my analysis of the bug below.
I am familiar with Adobe's PDF definition:
PDF Reference, sixth edition. Adobe Portable Document Format
Version 1.7, November 2006. Abobe Systems Incorporated.
I examined the PDF file in detail and it is quite clear what the bug is. Object 1 of the PDF file starts at byte offset 10, and it is a stream object containing the main image data in compressed JPEG format. The Length field for the stream object (at byte offset 168) is set to 1051875. However, the actual compressed stream data is only 64914 bytes long.
This is incorrect, because the PDF Reference (Section 3.2.7, p.61, "Stream Extent") specifies that "If the stream has a filter, Length is the number of bytes of encoded data." (emphasis in original). In other words, the stream length should be set to 64914, which is the length of the JPEG encoded data, and not 1051875 (which is presumably the length of the raw unencoded image data).
Moreover, four of the entries in the PDF xref table (at offset 65504) are incorrect:
the byte offset for object 2 is given as 1052085 (actual location of object 2 is 65124);
the byte offset for object 3 is given as 1052140 (actual location of object 3 is 65179);
the byte offset for object 4 is given as 1052206 (actual location of object 4 is 65245);
the byte offset for object 5 is given as 1052383 (actual location of object 5 is 65422).
Also, the PDF startxref pointer (at offset 65674) points to 1052465, whereas the actual location of the xref table is byte offset 65504.
Note that in all six cases, the error is exactly equal to the difference between the declared stream length (1051875) and the actual stream length (64914):
1051875 - 64914 = 986961
1052085 - 65124 = 986961
1052140 - 65179 = 986961
1052206 - 65245 = 986961
1052383 - 65422 = 986961
1052465 - 65504 = 986961
It looks like this is a simple programming error in the printer's PDF generation software: all the offsets are computed as if the length of the embedded image stream were 1051875, whereas it is actually 64914.
I scanned at different page sizes, resolutions, and so on. Each time, the actual byte offsets were slightly different (depending on the length of the encoded image stream), but the above relationships still hold in each case.
Please fix this! It is not really acceptable for an HP scanner to produce broken PDF files. Thanks, -- Peter

Hi @Selinger
One of the important things to point out is that the Webscan feature was designed for diagnostic purposes. The intended method of scanning is with HP software and the software build into the OS.
For Mac users this includes Apple Preview, Image Capture, or scanning from the Print and Fax Window.
For Windows users, non HP software includes, Windows Live Photo GAllery, Paint, and Windows Fax and Scan.
Webscan is a great alternative, but it is very basic. Your best option it to install the HP software and us the HP Scan program.
If there is a particular reason you are using Webscan and prefer to scan this way, the only thing I can really suggest is to try a different browser.
Please let me know the outcome of a different Browser, what Browser you are currently using, and what happens when you scan with HP software. If you require further assistance, please also include your operating system. What operating system, and version do you have? Mac or Windows?
I hope this helps.
Please click the Thumbs up icon below to thank me for responding.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
Sunshyn2005 - I work on behalf of HP

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