Chances are infinitesimally small you can fix it. If you start to maintain it, you'll be the one who gets the blame if it doesn't work. In an absolute best-case scenario you get to rewrite it whole in your spare time, while trying to keep the legacy code together with ducttape and chickenwire on your employers time.

Get out, get out now. They don't need a maintenance programmer, they need a ninja programmer, the liquidator kind.