This Thor vinyl figure is released by Funko in their POP! Marvel x Avengers: Age of Ultron vinyl figure series.
Funko POP! is a crossover vinyl figure series by Funko and other famous franchises such as Disney, Pixar, DC Comics, Marvel Comics, Simpsons, South Park, Uglydoll, etc. Each POP! figure is about ~3" to ~5" tall and crafted in a Japanese anime/manga super-deformed style (NOTE: due to the unique design of each character, the actual size of the figures may be smaller or bigger than stated).
The POP! Marvel x Avengers: Age of Ultron series features characters from the second Avengers live action movie which is based on the Marvel Universe superhero team the Avengers, such as Ultron, Hulk, Iron Man, Captain America, Thor, Hawkeye, Vision, etc.