My document came in reverse order. How do I change the order?

The following script can be added to the Acrobat application JavaScript folder or the user's JavaScript folder.

// Add a menu item to reverse all pages in the active document
// Complements: Planet PDF (http://www.planetpdf.com/)

app.addMenuItem({ cName: "Reverse", cParent: "Edit", cExec: "PPReversePages();", cEnable: "event.rc = (event.target != null);", nPos: 0
});

function PPReversePages()
{
var t = app.thermometer;
t.duration = this.numPages;
t.begin();
for (i = this.numPages - 1; i >= 0; i--)
{
  t.value = (i-this.numPages)*-1;
  this.movePage(i);
  t.text = 'Moving page ' + (i + 1);
}
t.end();
return true;
}

After installing it, restart Acrobat and one should see a new menu item under "Edit" labeled "Reverse". Now open a PDF and click on the new menu option.