How to open pdf file in Windows Phone 8?

You have to use the LaunchFileAsync method of Launcher class. Example:

// Access the file.
StorageFile pdfFile = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync("file.pdf");

// Launch the pdf file.
Windows.System.Launcher.LaunchFileAsync(pdfFile);

You will find more info here:

Auto-launching apps using file and URI associations for Windows Phone 8

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