SharpView High-Resolution PDF Viewer for Atlassian Confluence is exactly the purpose of the two-word question. Supports HTML5 and multiple OS, devices, browsers, etc. all from Confluence.
Click the link above for an example that is in-page, or here is a video.
I'm not sure what your question is, since you did not describe it. However, you might want to take a look at the following links:
PDF export customisation: https://confluence.atlassian.com/display/DOC/Customising+Exports+to+PDF
Troubleshooting PDF issues: https://confluence.atlassian.com/display/CONFKB/PDF+Issues+Troubleshooting
I hope it helps!
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