Hi Pankaj,
By looking the salary slip, it first gives the impression of salary slip generated by standard software used in corporates but when you look more carefully or you discussed with the person whose company have similar type of account management, He can clearly tell you there is a important thing is missing ,i.e Employee ID. Because if this person's company used fully automated accounting software, then a unique employee ID is must. On the other side if there is some manual interaction then salary slip should be signed by authorised signatory.
Also I want to explain the automated and manual termed used above. In corporates, they have their intranet portal through which they interact to their employees and also maintain their financial & personnel data. In these type of organization because there are large number of peoples in tens of thousands or even lakh, employees themself take the printout of salary slips which are automatically generated & uploded by HR and accounts department on portal at the end of the month. On the other side in the organisation where there are less number of employees and they dont use such a system, there salary slip are generated by HR/accounts department and handed over to employee. Because these salary slip are given by some signing authority hence these are counter signed by the same person.
Also one more thing, this salary slip is in doc format. Normally the automated salary slip are in non editable PDF format file, so that no body can edit it.
By the way, What thing boost you to check the authentication of this salary slip, may be some other thing, it will help other ? Also please do the reference check before coming to any conclusion. We may be wrong and its a matter of someone's career.