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pdf2john: Treat PDF Permissions value as a signed 32-bit integer #5993

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pdf2john: Treat PDF Permissions value as a signed 32-bit integer #5993

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2c8ff7f
Fix permission value calculation in PDF.pm
iCMDdev May 31, 2026
09fa63a
Fix permission value calculation in pdf2john.py
iCMDdev May 31, 2026
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6 changes: 5 additions & 1 deletion run/lib/PDF.pm
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Original file line number Diff line number Diff line change
Expand Up @@ -1204,7 +1204,11 @@ sub DecryptInit($$$)
$$encrypt{_meta} = 1;
}

printf("\$pdf\$%d*%d*%d*%d*%d*%d*", $ver, $rev, $$encrypt{Length} || 40, $$encrypt{P}, $$encrypt{_meta} || 0, length($id));
# PDF /P is a signed 32-bit integer
my $perm = $$encrypt{P};
$perm -= 4294967296 if $perm >= 2147483648;

printf("\$pdf\$%d*%d*%d*%d*%d*%d*", $ver, $rev, $$encrypt{Length} || 40, $perm, $$encrypt{_meta} || 0, length($id));
my $str = $id;
$str =~ s/(.)/ sprintf '%02x', ord $1 /seg;
printf("%s*", $str);
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2 changes: 2 additions & 0 deletions run/pdf2john.py
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Expand Up @@ -73,6 +73,8 @@ def __init__(self, file_name: str, strict: bool = False):
self.algorithm: int = self.encrypt_dict.get("/V")
self.length: int = self.encrypt_dict.get("/Length", 40)
self.permissions: int = self.encrypt_dict["/P"]
if self.permissions >= 2**31:
self.permissions -= 2**32
self.revision: int = self.encrypt_dict["/R"]

@property
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