I would recommend to allow editors to upload files in the media section (maybe add a folder "Embedded PDF's" or something for organization) by editing the user groups.

Then, in the DocumentTypes you want to display the pdf, you can add a property with the "media picker" editor, so they can choose a pdf-file. You can also add a start folder for the media section.

In your template, you can then use a iFrame to display the pdf:

// check for file and make sure its a pdf
if (Model.File != null && Model.File.UmbracoExtension == "pdf")
{
    // display pdf in iframe
    <iframe src="@Model.File.Url" />
}

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