Regardless of the magazine’s origin, you need to open the file. Here is the definitive guide to fixing the double extension problem.
If you are terrified of breaking the file, you can force it to open: Tight-Magazine.pdf.pdf
Reddit’s r/lostmedia has a small thread dedicated to Tight-Magazine.pdf.pdf. Users describe it as a "glitch art" project—a PDF that contains embedded video files and interactive elements that only work when the file name has the exact double extension. Warning: This is likely an urban legend. A PDF with a double extension does not change its internal code. Regardless of the magazine’s origin, you need to