PDF 1.7 separator unmatched

[Nism0]

Replace 4294967292 with -4 and use mode 10400.

You nailed it! It worked. Thanks a lot man. Could you elaborate a bit on why it actually worked and what this issue is actually related to (pdf2john, hashcat bug)? I'd appreciate.

Edit: Hashcat recognizes the hash even if I replace 4294967292 with -1 but can't crack it (exhausts).