From SQL yo can try
CL: CALL QCMDEXC('CPYSPLF FILE(AUMENTO1) TOFILE(*TOSTMF) JOB(557767/RAB/AUMENTO1) SPLNBR(1) TOSTMF(/REPORTES/xxxxxx.PDF) STMFOPT(*REPLACE) WSCST(*PDF)', 0000000132.00000);
I don't know C# but from interactive SQL (in ACS) this works