If your need is simply to visualize and in no way to have more control over the PDF, then I can only recommend using the library ng2-pdf-viewer.
Full documentation on its use is available on the project's npm page. There's also a link to a demo to see how it works in real-life conditions.

However, if the need is broader than simply visualization, it may be worth looking at pdf.js, which is the library used by Firefox and Chrome to display PDFs. You can find all the project information on the github project.