This protein is made up of two domains: the N-terminal domain has exoglucanase activity while the C-terminal domain is an endoglucanase. Endohydrolysis of (1->4)-beta-D-glucosidic linkages in cellulose, lichenin and cereal beta-D-glucans. Hydrolysis of (1->4)-beta-D-glucosidic linkages in cellulose and cellotetraose, releasing cellobiose from the non-reducing ends of the chains. In the N-terminal section; belongs to the glycosyl hydrolase 10 (cellulase F) family. In the C-terminal section; belongs to the glycosyl hydrolase 5 (cellulase A) family.