Hydrolyzes high molecular weight hyaluronic acid to produce small oligosaccharides. In venom, it may participate in the degradation of the extracellular matrix thus allowing a rapid spread of other venom components during the envenomation process. Random hydrolysis of (1->4)-linkages between N-acetyl-beta-D-glucosamine and D-glucuronate residues in hyaluronate. Inhibited by heparin, and to a lesser extent by DTT, Fe(3+) and Cu(2+). Not inhibited by reduced glutathione, L-cysteine, EDTA, Ca(2+) or Mg(2+). Optimum pH is 4.5. Optimum temperature is 50 degrees Celsius. Activity decreases when incubated at temperatures above 24 degrees Celsius for 10 minutes. No activity remains after 10 minutes at 65 degrees Celsius. Expressed by the venom gland. Belongs to the glycosyl hydrolase 56 family.