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https://issues.apache.org/jira/browse/TIKA-4782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18095926#comment-18095926
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Damien Bories commented on TIKA-4782:
-------------------------------------

Just to clarify : for privacy reason, I did not attach the actual problematic 
file from production. Instead I created a simple PDF using Microsoft Word and 
edited it in a text editor to add the same comments/metadata at the start, 
before the "%PDF-" tag.

I think the original file was generated to be used in a specific printing 
setup, but it is still a valid PDF file and very much not a matlab file.

Do you think the Tika rules could be adapted to ignore all the starting "%% 
comments" before the "%PDF-" tag?

> PDF detected as matlab file
> ---------------------------
>
>                 Key: TIKA-4782
>                 URL: https://issues.apache.org/jira/browse/TIKA-4782
>             Project: Tika
>          Issue Type: Bug
>    Affects Versions: 3.2.3
>            Reporter: Damien Bories
>            Priority: Major
>         Attachments: tika-sees-pdf-as-matlab.pdf
>
>
> Hello,
> In a few cases within my organisation, we encounter PDF files that get 
> detected as matlab files. I attached an example of PDF file that gets 
> detected wrongly as matlab.
> Tested with Tika 3.2.3
> A similar issue was raised a few years ago : TIKA-3328
> I checked the corresponding fix [TIKA-3328 -- make PDF detection a bit more 
> flexible · apache/tika@3381c73 · 
> GitHub|https://github.com/apache/tika/commit/3381c7328875073300fb6fc6b0be850562977d60]
>  and if I had to take a guess, I'd say that in my case, the "metadata block" 
> starting with %% is longer than the 512 offset.



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