Loading obscure files when visiting some pages of the site. How to solve the problem?

Question

safari

The client complains that one of his employees, when visiting some sections of the site (product cards where the employee was not previously in this browser), incomprehensible files with names like "GEhmj9HbUws" are saved in the Downloads folder on the computer. Moreover, without a request to save! O_o Almost all files have a size of 5kb. Inside the abracadabra.
- Mac
- Safari 7.0.5
- Ajax, jquery, a lot of javascript work on the site
No one except this employee can reproduce the problem.
Help with advice, where to dig?

Answer 1

perhaps a plugin?

Answer 2

Look at the northern part, she shoves the save.
Or reinstall your browser.

Answer 3

Run everything well with an antivirus.