PDF-hul: JHOVE hangs in infinite loop

[Bodensuri]

Validation process with the PDF of a dissertation ran for minutes before I aborted the process. I assume, there's something in the pdf structure which causes JHOVE to stuck in an infinite loop. This problem occurs for JHOVE GUI 1.28.0 (2023-05-18, Buffer Size -1, PDFhul selected) and with PDF-hul 1.12.4 (16.03.2023). The same problem with JHOVE 1.26.1, Plugin Version 1.2, plugin name PDF-hul-1.26.

The Dissertaion "Making CIAM..." is too large for the Upload. The PDF is a available from https://www.research-collection.ethz.ch/handle/20.500.11850/183653. The direct link is here:
https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/183653/KALPAKCI_MakingCIAM_Dissertation.pdf?sequence=3&isAllowed=y

[RvanVeenendaal]

Please note that I tested the dissertation file with JHOVE 1.26.1, 2022-07-14 on Windows 10, and that it produces results.
The file seems to be a well-formed and valid PDF 1.4 with a PDF-HUL-136 infomessage.
It just takes a long time, about half an hour on my Intel Xeon 3.10 GHz laptop with 8 GB RAM, and produces 13 megabytes worth of output.
See the attached output of "jhove.bat -m pdf-hul KALPAKCI_MakingCIAM_Dissertation.pdf > dissertation.txt".
dissertation.zip

[fitnycdigitalinitiatives]

I'm getting these same errors with Tiff files after upgrading to Archivematica 1.15.1 which uses JHOVE 1.26.1. Tested the same files on earlier version of JHOVE (1.20.0) without any errors.

[Bodensuri]

Thank you for investigating the issue. Indeed, the file did not produce an infinite loop. Nevertheless, I feel that the issue should not be closed yet.
The result of the JHOVE validation (dissertation.txt, attached above by Rvan Veenendal) is a file with around 564,000 lines. Lines 47 to 555706 describe metadata for around 60'000 images. The metadata for each image requires 9 lines each and looks ok.
However, I can only find about 200 images in the PDF when I open it with Adobe. The validation with Adobe Preflight only takes a few seconds. Preflight only finds the 200 images, no attachments and nothing conspicuous. VeraPDF also only takes a few seconds, finds a small (but slightly higher) number of images, and states that the file is a valid PDF/A-1a file.
There are several method of embedding images in a PDF, but these 60'000 images found by JHOVE are puzzling me. Couldn't it be a bug in JHOVE?