Base64 conversion error

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Good morning I’m trying to convert a base string 64

$b = ((New-Object System.Net.WebClient).DownloadString("domain/file")

$c = [System.Convert]::FromBase64String($b)

but give me the error

Exception calling "FromBase64String" with "1" argument(s): "A entrada não é uma cadeia de Base-64 válida dado que
contém um caráter que não é de base 64, mais de dois carateres de preenchimento ou um caráter ilegal entre os
carateres de preenchimento. "
At line:1 char:1
+ $c = [System.Convert]::FromBase64String($b)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : FormatException

What could I be doing wrong?

Thank you

powershell

  • I did the test here and did not generate this exception, I believe the problem is present in the contents of variable $b.

  • the content you used was a PE or a bin?

  • It was a local string that I myself declared with Base64 content.

  • I tried to replace PE with PE in Base64 nor txt format but still does not give

  • The problem is with the data you are trying to convert from base64 for binary. Could attach the question.

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