It's just a one-liner, cannonical JAPH. It runs under use strict; and use warnings; It's a long line, so I've placed it in readmore tags: 
#!/usr/bin/perl -w
$_='';s..qq:\x77\x68\x69\x6c\x65\x28\x22\x32\x66\x64\x65\x30\x34\x61\x
+62\x65\x37\x36\x63\x30\x33\x36\x63\x39\x30\x37\x34\x35\x38\x36\x63\x3
+1\x22\x3d\x7e\x6d\x2f\x28\x2e\x29\x2f\x67\x29\x7b\x20\x70\x72\x69\x6e
+\x74\x20\x73\x75\x62\x73\x74\x72\x28\x22\x5c\x78\x32\x30\x5c\x78\x32\
+x63\x5c\x78\x34\x61\x5c\x78\x35\x30\x5c\x78\x36\x31\x5c\x78\x36\x33\x
+5c\x78\x36\x35\x5c\x78\x36\x38\x5c\x78\x36\x62\x5c\x78\x36\x63\x5c\x7
+8\x36\x65\x5c\x78\x36\x66\x5c\x78\x37\x32\x5c\x78\x37\x33\x5c\x78\x37
+\x34\x5c\x78\x37\x35\x22\x2c\x68\x65\x78\x28\x24\x31\x29\x2c\x31\x29\
+x3b\x20\x7d:.xee;

[download]
Update: how it works...
The substitution regexp evaluates twice. The first eval results in:
while("2fde04abe76c036c9074586c1"=~m/(.)/g){ print substr("\x20\x2c\x4a\x50\x61\x63\x65\x68\x6b\x6c\x6e\x6f\x72\x73\x74\x75",hex($1),1); }

The string passed to substr() contains one of each unique character in the "Just another Perl hacker," phrase -- in other words, ' ,JPacehklnorstu'. The string used in the while condition contains the single-digit "map" to form the output phrase.

As the loop iterates, the regexp iterates over the "map" and prints out the correct character from the hex-encoded string.

radiantmatrix
require General::Disclaimer;

In reply to My first JAPH by radiantmatrix

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.