NEW YORK (TheStreet) -- Petrobras  (PBR.A - Get Report) stock is up by 9.47% to $4.51 in mid-afternoon trading on Friday, as Brazil's real strengthens and oil prices surge today.

Petrobras is a Rio de Janeiro-based energy company.

Brazil's currency climbed by 1.7% to 3.6262 per dollar earlier today on heightened speculation that President Dilma Rousseff is nearing impeachment, Bloomberg reports.

Many people believe that ousting Rousseff, who has overseen the country's worst recession in decades, is the best way to spark an economic recovery.

Additionally, oil prices are soaring this afternoon following an unexpected decline of 5 million barrels in U.S. crude stockpiles last week. Investors also are optimistic that a meeting between major producers in Doha this month could lead to a coordinated output freeze.

Crude oil (WTI) is rising by 5.93% to $39.47 per barrel and Brent crude is rallying by 5.81% to $41.72 per barrel.

Separately, TheStreet Ratings team rates the stock as a "sell" with a ratings score of D.

Petrobras's weaknesses include its disappointing return on equity, weak operating cash flow, generally disappointing historical performance in the stock itself and generally high debt management risk.

You can view the full analysis from the report here: PBR.A

TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this article's author.