Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cdc53fa521ab1c…

MALICIOUS

PDF

31.6 KB
MD5: 4b5535b0234acd0d5b8d5b19a353d354 SHA-1: 1b1fc2f5ef425786e4a3df0e4f09ada8b21ad57f SHA-256: 99cdc53fa521ab1c72141f32061c08368105059684c26ca5e139fe536e6343e0
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The sample is a PDF file identified as malicious by ClamAV with the signature Js.Exploit.HTML-30. It contains XFA form elements and embedded JavaScript. The JavaScript appears to be obfuscated but includes calls to `app.alert` and `eval`, suggesting an attempt to execute arbitrary code. The reconstructed JavaScript string `app.alert(1241) ; for(i=0;i-7554<0;i+=2){z=i;test3()};try{Number().prototype.a1;}catch(qwg){eval(sqwe123ba[0] /CourierStd 10 Tf 0 g sqwe123ba asdvsa[0] a1[0] /Helv 0 Tf 0 g)}` indicates the potential for code execution. The embedded URL `http://www.xfa.org/schema/xfa-template/2.5/` is likely related to the XFA form structure.

Heuristics 4

  • ClamAV: Js.Exploit.HTML-30 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.HTML-30
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.x&#102;a.org/schema/xfa-template/2.5/

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