most likely the SignedData object is wrapped into a ContentInfo which has to be removed before accessing the SignedData please see demo.pkcs.TestContentInfo, method getSignedData(Stream) for a sample.

ProyectoFinalTeledeteccion\b1.jpg
..........................\b2.jpg
..........................\conM.jpg
..........................\eseSI.fig
..........................\eseSI.m
..........................\final.m
..........................\sin.jpg
..........................\untitled.jpg
..........................\wall.jpg
ProyectoFinalTeledeteccion

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