OSS-Fuzz issue 70147

[pietermarsman]

OSS-Fuzz has found a bug in this project. Please see https://oss-fuzz.com/testcase?key=4908991008800768 for details and reproducers.

This issue is mirrored from https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=70147 and will auto-close if the status changes there.

If you have trouble accessing this report, please file an issue at https://github.com/google/oss-fuzz/issues/new.

Testcase raises:

 	ValueError: too many values to unpack (expected 4)
	Traceback (most recent call last):
	  File "fuzzing/extract_text_fuzzer.py", line 26, in fuzz_one_input
	  File "pdfminer/high_level.py", line 176, in extract_text
	  File "pdfminer/pdfinterp.py", line 987, in process_page
	ValueError: too many values to unpack (expected 4)