diff --git a/tools/test_modules/m10400.pm b/tools/test_modules/m10400.pm
index a98ba8513..4ed593d40 100644
--- a/tools/test_modules/m10400.pm
+++ b/tools/test_modules/m10400.pm
@@ -112,24 +112,24 @@ sub module_verify_hash
 
   my ($hash_in, $word) = split ":", $line;
 
-  next unless defined $hash_in;
-  next unless defined $word;
+  return unless defined $hash_in;
+  return unless defined $word;
 
   my @data = split /\*/, $hash_in;
 
-  next unless scalar @data == 11;
-
-  next unless (shift @data eq '$pdf$1');
-  next unless (shift @data eq '2');
-  next unless (shift @data eq '40');
-  my $P      = shift @data;
-  next unless (shift @data eq '0');
-  next unless (shift @data eq '16');
-  my $id     = shift @data;
-  next unless (shift @data eq '32');
-  my $u      = shift @data;
-  next unless (shift @data eq '32');
-  my $o      = shift @data;
+  return unless scalar @data == 11;
+
+  return unless (shift @data eq '$pdf$1');
+  return unless (shift @data eq '2');
+  return unless (shift @data eq '40');
+  my $P        = shift @data;
+  return unless (shift @data eq '0');
+  return unless (shift @data eq '16');
+  my $id       = shift @data;
+  return unless (shift @data eq '32');
+  my $u        = shift @data;
+  return unless (shift @data eq '32');
+  my $o        = shift @data;
 
   my $salt   = $id;
   my $param  = $u;
diff --git a/tools/test_modules/m10500.pm b/tools/test_modules/m10500.pm
new file mode 100644
index 000000000..52e3ae381
--- /dev/null
+++ b/tools/test_modules/m10500.pm
@@ -0,0 +1,186 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Crypt::RC4;
+use Digest::MD5 qw (md5);
+
+my $PDF_PADDING =
+[
+  0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41, 0x64, 0x00, 0x4e, 0x56,
+  0xff, 0xfa, 0x01, 0x08, 0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68, 0x3e, 0x80,
+  0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a
+];
+
+sub module_constraints { [[0, 15], [32, 32], [-1, -1], [-1, -1], [-1, -1]] }
+
+sub pdf_compute_encryption_key
+{
+  my $word_buf  = shift;
+  my $padding   = shift;
+  my $id        = shift;
+  my $u         = shift;
+  my $o         = shift;
+  my $P         = shift;
+  my $V         = shift;
+  my $R         = shift;
+  my $enc       = shift;
+
+  ## start
+
+  my $data;
+
+  $data .= $word_buf;
+
+  $data .= substr ($padding, 0, 32 - length $word_buf);
+
+  $data .= pack ("H*", $o);
+  $data .= pack ("I",  $P);
+  $data .= pack ("H*", $id);
+
+  if ($R >= 4)
+  {
+    if (!$enc)
+    {
+      $data .= pack ("I", -1);
+    }
+  }
+
+  my $res = md5 ($data);
+
+  if ($R >= 3)
+  {
+    for (my $i = 0; $i < 50; $i++)
+    {
+      $res = md5 ($res);
+    }
+  }
+
+  return $res;
+}
+
+sub module_generate_hash
+{
+  my $word = shift;
+  my $id   = shift;
+  my $u    = shift;
+  my $o    = shift;
+  my $P    = shift;
+  my $V    = shift;
+  my $R    = shift;
+  my $enc  = shift;
+
+  if (defined $u == 0)
+  {
+    $u = "0" x 64;
+  }
+
+  my $u_save = $u;
+
+  if (defined $o == 0)
+  {
+    $o = "0" x 64;
+  }
+
+  if (defined $R == 0)
+  {
+    $R = random_number (3, 4);
+  }
+
+  if (defined $V == 0)
+  {
+    $V = ($R == 3) ? 2 : 4;
+  }
+
+  if (defined $P == 0)
+  {
+    $P = ($R == 3) ? -4 : -1028;
+  }
+
+  if (defined $enc == 0)
+  {
+    $enc = ($R == 3) ? 1 : random_number (0, 1);
+  }
+
+  my $padding;
+
+  for (my $i = 0; $i < 32; $i++)
+  {
+    $padding .= pack ("C", $PDF_PADDING->[$i]);
+  }
+
+  my $res = pdf_compute_encryption_key ($word, $padding, $id, $u, $o, $P, $V, $R, $enc);
+
+  my $digest = md5 ($padding . pack ("H*", $id));
+
+  my $m = Crypt::RC4->new ($res);
+
+  $u = $m->RC4 ($digest);
+
+  my @ress = split "", $res;
+
+  for (my $x = 1; $x <= 19; $x++)
+  {
+    my @xor;
+
+    for (my $i = 0; $i < 16; $i++)
+    {
+      $xor[$i] = chr (ord ($ress[$i]) ^ $x);
+    }
+
+    my $s = join ("", @xor);
+
+    my $m2 = Crypt::RC4->new ($s);
+
+    $u = $m2->RC4 ($u);
+  }
+
+  $u .= substr (pack ("H*", $u_save), 16, 16);
+
+  my $hash = sprintf ('$pdf$%d*%d*128*%d*%d*16*%s*32*%s*32*%s', $V, $R, $P, $enc, $id, unpack ("H*", $u), $o);
+
+  return $hash;
+}
+
+sub module_verify_hash
+{
+  my $line = shift;
+
+  my ($hash_in, $word) = split ":", $line;
+
+  next unless defined $hash_in;
+  next unless defined $word;
+
+  my @data = split /\*/, $hash_in;
+
+  next unless scalar @data == 11;
+
+  my $V        = shift @data; $V = substr ($V, 5, 1);
+  my $R        = shift @data;
+  return unless (shift @data eq '128');
+  my $P        = shift @data;
+  my $enc      = shift @data;
+  return unless (shift @data eq '16');
+  my $id       = shift @data;
+  return unless (shift @data eq '32');
+  my $u        = shift @data;
+  return unless (shift @data eq '32');
+  my $o        = shift @data;
+
+  return unless defined $id;
+  return unless defined $word;
+
+  $word = pack_if_HEX_notation ($word);
+
+  my $new_hash = module_generate_hash ($word, $id, $u, $o, $P, $V, $R, $enc);
+
+  return ($new_hash, $word);
+}
+
+1;