Impossible to decode XFormObject ...

[DL6ER]

I'm trying to convert a lot of random PDFs found on the web to pure-text for further analysis of potential statistical abnormalities.

Environment

Which environment were you using when you encountered the problem?

$ python -m platform
Linux-5.4.0-122-generic-x86_64-with-glibc2.29

$ python -c "import PyPDF2;print(PyPDF2.__version__)"
2.10.3

Code + PDF

This is a minimal, complete example that shows the issue:

import PyPDF2
with open("p.a. trento.pdf", "rb") as f:
  pdfreader = PyPDF2.PdfFileReader(f, strict=False)
  full_content = " ".join([page.extractText() for page in pdfreader.pages])

PDF used above: p.a. trento.pdf
Another example: qqplots.pdf

I can search for further files with errors, if needed (the two examples above are both plot files). I will obviously participate in testing and verifying any proposed bugfixes.

Traceback

There is no crash, however, these are 4164 warnings like

 impossible to decode XFormObject /M0
[...]
 impossible to decode XFormObject /M3
[...]
 impossible to decode XFormObject /M5
[...]
 impossible to decode XFormObject /F1-DejaVuSans-minus

What do I expect?

I'd like to just get the text without flooding my log file with warnings (during a simple test on a few hundred files, the log file grew into the Gigabytes).