The man is accused of attacking the employee after a dispute over theft.
Video released by Philadelphia police shows the suspect charging and overpowering the store employee with what appears to be a knife.
When the victim's shirt is ripped off, blood can be seen on his back and ribs.
WARNING: THIS VIDEO CONTAINS GRAPHIC CONTENT.
Philadelphia police described the suspect as a Black male in his 30s. He is "bald with a trimmed beard wearing a black long sleeve shirt, grey shorts, red and grey tights and black boots and carrying a Gucci shoulder bag."
Anyone with information about this crime or the suspect, call the Northwest Detective Divison at (215) 686-3353/3354.