The document has an unrecognized file format.

The document is a container.

The document has a recognized file format but is corrupt.

The document was successfully indexed.

The document contains no text.

The document is encrypted.

The document is in an unrecognized format and is being indexed using the binary filtering algorithm.

The document contains images without text, other than metadata and annotations. This flag can be used to detect image-only PDF files, but it is not a perfect indicator because a file could need OCR and still have some text in it. For example, a PDF file may have one page with text and 10 pages of scanned images, or it may have scanned images and a bit of text (but not the text of the scanned images) on each page.

The document could not be opened due to a file open failure.

There was insufficient memory to process the document.

A portion of the document is corrupt.

A portion of the document is encrypted.