PdfReadError: trailer can not be read ()

[ma-pony]

When I read certain PDF files(maybe not standard pdf), an exception is thrown,
I hope I can read them normally

Environment

Which environment were you using when you encountered the problem?

$ python -m platform
macOS-10.16-x86_64-i386-64bit

$ python -c "import pypdf;print(pypdf.__version__)"
3.2.1

Code + PDF

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

from io import BytesIO

import requests
from pypdf import PdfReader

if __name__ == '__main__':
    url = "https://gz-gov-open-doc.oss-cn-gz-ysgzlt-d01-a.ltops.gzdata.com.cn/1024FPA/open/37560735-0101-4199-8dd6-c9015c438f13.pdf"
    res = requests.get(url)
    print(res.text)
    PdfReader(BytesIO(res.content))

Share here the PDF file(s) that cause the issue. The smaller they are, the
better. Let us know if we may add them to our tests!
小型企业声明函.pdf

Traceback

This is the complete Traceback I see:

Traceback (most recent call last):
  File "/Users/rccpony/Library/Caches/pypoetry/virtualenvs/KPnmHDqb-py3.8/lib/python3.8/site-packages/pypdf/_reader.py", line 1713, in _read_xref_tables_and_trailers
    xrefstream = self._read_pdf15_xref_stream(stream)
  File "/Users/rccpony/Library/Caches/pypoetry/virtualenvs/KPnmHDqb-py3.8/lib/python3.8/site-packages/pypdf/_reader.py", line 1842, in _read_pdf15_xref_stream
    self._read_xref_subsections(idx_pairs, get_entry, used_before)
  File "/Users/rccpony/Library/Caches/pypoetry/virtualenvs/KPnmHDqb-py3.8/lib/python3.8/site-packages/pypdf/_reader.py", line 1907, in _read_xref_subsections
    assert start >= last_end
AssertionError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/rccpony/PycharmProjects/pdf.py", line 10, in <module>
    PdfReader(BytesIO(res.content))
  File "/Users/rccpony/Library/Caches/pypoetry/virtualenvs/KPnmHDqb-py3.8/lib/python3.8/site-packages/pypdf/_reader.py", line 319, in __init__
    self.read(stream)
  File "/Users/rccpony/Library/Caches/pypoetry/virtualenvs/KPnmHDqb-py3.8/lib/python3.8/site-packages/pypdf/_reader.py", line 1508, in read
    self._read_xref_tables_and_trailers(stream, startxref, xref_issue_nr)
  File "/Users/rccpony/Library/Caches/pypoetry/virtualenvs/KPnmHDqb-py3.8/lib/python3.8/site-packages/pypdf/_reader.py", line 1722, in _read_xref_tables_and_trailers
    raise PdfReadError(f"trailer can not be read {e.args}")
pypdf.errors.PdfReadError: trailer can not be read ()

[pubpub-zz]

@ma-pony
this looks like a error in the interpretation of the standard. The PR should solve this

[wasa-ism]

I am facing the exact issue while trying to read this PDF.
ca-dmv-form-dl-44.pdf

[pubpub-zz]

@wasa-ism
please provide more details : version + test code + error output