If you want to know if a PDF file was created in Revit:
In Adobe Acrobat you can view the PDF creator in the document properties:
https://helpx.adobe.com/acrobat/using/pdf-properties-metadata.html
![vitorbortoncello_0-1719341541643.png vitorbortoncello_0-1719341541643.png](https://forums.autodesk.com/t5/image/serverpage/image-id/1379889iCAE4E1CA11FEBFAA/image-size/medium?v=v2&px=400)
If you want to know if a DWG file was created in Revit:
1. Open the DWG file in AutoCAD.
2. Enter Filter on the command line.
3. Select XDATA ID from the Filter drop-down list.
4. Click Select.
5. In XDATA ID list, look for an entry for Revit. If such an entry
exists, then the file was created in Revit
![vitorbortoncello_1-1719342867809.png vitorbortoncello_1-1719342867809.png](https://forums.autodesk.com/t5/image/serverpage/image-id/1379893iD55D4E608A41A368/image-size/medium?v=v2&px=400)
If you just want to check if it was exported from 3D model: if your Autocad is not LT, you can try just rotating the drawing in Autocad to see the 3D
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