That's 85% phosphoric acid.
If you look on page 2 it says conc < 10%, not classified for physical or health hazards under GHS (globally harmonised system).
phosphoric acid is not intrinsically poisonous (in fact, it quit a common biological acid), but concentrated solutions, like those of any acid, will cause burns.
As the pH of the solution is significantly higher than the relevant pKa of phosphoric acid (2.15), and as it's a weak acid and thus probably acting as a buffer in this context, the concentration of phosphoric acid will almost certainly be less than 10% (probably closer to ~ 1%).