While reindexing my master / web indexes, the reindex failed and I saw these error messages in the logs:


Exception: System.IO.FileLoadException
Message: Expected pdf format
Source: Sitecore.ContentSearch.ContentExtraction
at Sitecore.ContentSearch.ContentExtraction.Readers.PdfSharpReader.ValidateIsPdf(String path)
at Sitecore.ContentSearch.ContentExtraction.Readers.PdfSharpReader.ReadAll(String filePath)
at Sitecore.ContentSearch.ContentExtraction.Common.DefaultMediaItemTextExtractor.ExtractTextFromMedia(MediaItem mediaItem)

On further inspection, the media library items in question did in fact have PDF files attached, but when I downloaded the attachment, its size was 0 bytes. However, the PDF must have had a size at some point, because the Size field has a value greater than 0.

media item fields

How might this have happened? Worth noting is that the solution does make use of Azure blob storage to store media items.

1 Answer 1


This can happen if the blob of the media item (the actual media data) no longer exists in the configured blob storage provider - in your case Azure Blob storage.

As a first step, check the credentials for the Azure Blob storage provider still work correctly as perhaps it is just a permission issue reading the blob.

Some other scenarios to consider that could lead to this issue:

  • Another Sitecore instance connected to the same storage endpoint and perhaps deleted that media item
  • Your instance or another instance ran the blob migration tool and didn't complete the process correctly

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