Has xylanase, avicelase and cellobiohydrolase activity. Endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans. Endohydrolysis of (1->4)-beta-D-glucosidic linkages in cellulose, lichenin and cereal beta-D-glucans. Glycan degradation; xylan degradation. Belongs to the glycosyl hydrolase 10 (cellulase F) family.