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(Corrects headline and text to say Petrobras has unfunded liabilities in pension fund Petros, not a loss)
RIO DE JANEIRO, June 23 (Reuters) - Brazil's state-run oil company Petrobras said on Thursday its Petros pension fund had unfunded liabilities of 22.6 billion reais ($6.77 billion) at the end of 2015, adding that the company and beneficiaries must tackle the problem by increasing contributions.
$1 = 3.336 reais Reporting by Stephen Eisenhammer and Jeb Blount; Editing by Sandra Maler