If it is not possible to distribute the weight in the cabinet, fasten it to the wall or another cabinet or add weight to the bottom of the cabinet. Many of the accidents and injuries that occur can be placed into one of the five major classifications. But there are some that do not seem to it the said categories. Tilting back on chairs with rollers, for example, can produce a serious injury. And so can using that same chair as a ladder.
Staplers can be hazardous if used improperly.
Even paper can produce painful cuts. These cuts can be prevented by allowing more room for files in the file cabinet. Try to restrict material handling to the area between knuckle and shoulder height.