Okay, I think I have fully de-obfuscated it.
I was impressed before but now... I am at a loss for words.

<font color="#000000>
sub r {
  # get the first value of the array sent to me
  $z = shift @_;

  # create an 8 element, little endian bit array (@b)
  # containing the binary bits of $z
  foreach $_ (0 .. 7) {
      $b[$_] = vec($z, $_, 1);
  }
  
  # create a scalar $v containing the first bit
  my $v .= $b[0];
  foreach $_ (1, 3, 5) {
    # append the (3rd & 2nd),(5th & 4th) and (7th & 6th) bits
    $v .= $b[$_ + 1] . $b[$_];
  }

  # append the 8th bit
  $v .= $b[7];
  # $v now contains $b[0].$b[2].$b[1].$b[4].$b[3].$b[6].$b[5].$b[7]
  
  # return a bit vector of $v
  return pack('b*', $v);
}

sub e {
  # eval the first item passed
  eval $_[0];
  # return the value in $"
  $";
}

sub t {
  # split $_[0] into an array and send it through subroutine r and joi
+n the returned value 
  join '', map(r($_), split(//, $_[0], 0));
}

# redefine the input record separator ($/)
$/ = qq(mkd\@h   lqvj}"    |[mhrqj\@  WW   RB  ?=H\n   ;]B     y[I  LO
+]   opq   rc\@ PB   yS  MLQ\n 
  }By    SS]    hlq  vj\@   twq vP   GG  Rsa\n   hPw    lbPB|=B?;Q  ^B
+y_B|=B  ?;\\eplP  ByQ\nRH VVB
    E|Q    QVD  :lD       ]m   rc  \n ch\@I     ]{{   );

$n = "4       km   j\@  !vw\n\njpcl\@(clr\@0aeucl";

# acting on $n, replace " with a space and delete newlines and spaces
$n =~ tr/"\n / /d;
# $n now contains: 4kmj@!vwjpcl@(clr@0aeucl

# redefine the list separator ($")
# send $n to the t subroutine and store the returned value in $"
$" = t($n);

# $" now contains: Just Another Perl Hacker

$| = 1;

# acting on $/,  replace " with a space and delete newlines and spaces
$/ =~ tr/"\n / /d;
# $/ now contains: mkd@hlqvj} |[mhrqj@WWRB?=H;]By[ILO]opqrc@PBySMLQ}By
+SS]hlqvj@twqvPGGRsahPwlbPB|=B?;Q^By_B|=B?;\eplPByQRHVVBE|QQVD:lD]mrcc
+h@I]{{

$_ = t($/);
# $_ now contains the code listed after __END__

# eval $_ which creates a new print subroutine
e($_);

# run the new print subroutine passing: Just Another Perl Hacker
&print($");

__END__
# with comments and extra white space added by me :)
sub print {
  @z = split //,$_[0]; # split $_[0] into an array containing the char
+acters
  $y = 127;
  while ($y - 32) { # for ($y = 95, $y > 0, $y--)
    $y--;
    print join('', map(
    ord($z[$_]) > $y ? $z[$_] : chr($y) # ascii value of $z[$_] > $y? 
+if yes, then return $z[$_]; else return chr($y)
    , 0..$#z # for ($_ = 0, $_ <= $#z, $_++) {  
    ))."\r";
    sleep 1;
  }
}

[download]

In reply to Re: Countdown.... de-obfuscated by Mr. Muskrat
in thread Countdown.... by UnderMine

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.