The big, immediate threat for a foreign oil giant By: CNBC.com News November 19, 2014 at 14:15 PM EST Brazilian Petrobras shares stabilized for the first time in months, after falling 45% since late August. Is it time for investors to jump in or out? Read More >> Related Stocks: Morgan Stanley Oao Gazprom ADR iPath Dow Jones-Goldman Sachs Crude Oil Fund