What is main reason pdf validate return ParseObjectAttributes: can't find "obj"

[l2ysho]

I have some problematic PDF file which I want to validate, this file can be open for example in preview on Mac, but cant work with it programatically (for example read it with imagemagick). Pdfcpu valide returns this error, but I don't know what to do whit this information.

pdfcpu validate -v  65578d7ea39d215066a61fc9.pdf
validating(mode=relaxed) 65578d7ea39d215066a61fc9.pdf ...
 INFO: 2023/11/18 12:03:34 PDF Version 1.5 conforming reader
Fatal: pdfcpu: ParseObjectAttributes: can't find "obj"
github.com/pdfcpu/pdfcpu/pkg/pdfcpu/model.ParseObjectAttributes
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/model/parse.go:237
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.object
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/read.go:1807
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.ParseObject
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/read.go:1836
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.dereferenceObject
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/read.go:2421
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.dereferenceObjects
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/read.go:2523
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.dereferenceXRefTable
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/read.go:2602
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.Read
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/read.go:85
github.com/pdfcpu/pdfcpu/pkg/api.ReadContext
        github.com/pdfcpu/pdfcpu/pkg/api/api.go:55
github.com/pdfcpu/pdfcpu/pkg/api.Validate
        github.com/pdfcpu/pdfcpu/pkg/api/validate.go:47
github.com/pdfcpu/pdfcpu/pkg/api.ValidateFile
        github.com/pdfcpu/pdfcpu/pkg/api/validate.go:96
github.com/pdfcpu/pdfcpu/pkg/api.ValidateFiles
        github.com/pdfcpu/pdfcpu/pkg/api/validate.go:119
github.com/pdfcpu/pdfcpu/pkg/cli.Validate
        github.com/pdfcpu/pdfcpu/pkg/cli/cli.go:32
github.com/pdfcpu/pdfcpu/pkg/cli.Process
        github.com/pdfcpu/pdfcpu/pkg/cli/process.go:35
main.process
        github.com/pdfcpu/pdfcpu/cmd/pdfcpu/process.go:136
main.processValidateCommand
        github.com/pdfcpu/pdfcpu/cmd/pdfcpu/process.go:193
main.commandMap.process
        github.com/pdfcpu/pdfcpu/cmd/pdfcpu/cmd.go:143
main.main
        github.com/pdfcpu/pdfcpu/cmd/pdfcpu/main.go:56
runtime.main
        runtime/proc.go:267
runtime.goexit
        runtime/asm_arm64.s:1197
dereferenceObject: problem dereferencing object 5
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.dereferenceObject
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/read.go:2423
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.dereferenceObjects
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/read.go:2523
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.dereferenceXRefTable
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/read.go:2602
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.Read
        github.com/pdfcpu/pdfcpu/pkg/pdfcpu/read.go:85
github.com/pdfcpu/pdfcpu/pkg/api.ReadContext
        github.com/pdfcpu/pdfcpu/pkg/api/api.go:55
github.com/pdfcpu/pdfcpu/pkg/api.Validate
        github.com/pdfcpu/pdfcpu/pkg/api/validate.go:47
github.com/pdfcpu/pdfcpu/pkg/api.ValidateFile
        github.com/pdfcpu/pdfcpu/pkg/api/validate.go:96
github.com/pdfcpu/pdfcpu/pkg/api.ValidateFiles
        github.com/pdfcpu/pdfcpu/pkg/api/validate.go:119
github.com/pdfcpu/pdfcpu/pkg/cli.Validate
        github.com/pdfcpu/pdfcpu/pkg/cli/cli.go:32
github.com/pdfcpu/pdfcpu/pkg/cli.Process
        github.com/pdfcpu/pdfcpu/pkg/cli/process.go:35
main.process
        github.com/pdfcpu/pdfcpu/cmd/pdfcpu/process.go:136
main.processValidateCommand
        github.com/pdfcpu/pdfcpu/cmd/pdfcpu/process.go:193
main.commandMap.process
        github.com/pdfcpu/pdfcpu/cmd/pdfcpu/cmd.go:143
main.main
        github.com/pdfcpu/pdfcpu/cmd/pdfcpu/main.go:56
runtime.main
        runtime/proc.go:267
runtime.goexit
        runtime/asm_arm64.s:1197
        ```

[hhrutter]

I would have to analyse your file to tell you more or provide a fix so it passes validation.
If you can share the file please open an issue and attach the file or you can also send me an email.
Since this is really an issue there is nothing to discuss so I close this.
Thank you for using pdfcpu 💚