Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc59b54c3b7c28b…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: b0e46af8c20852e8ee2ed2bfd1993309 SHA-1: dbe176742b9b74f04b255f525d3eb5bd327bfcbf SHA-256: 6dc59b54c3b7c28b7f4549a8e26a01ddbef57db84561e99672c9626468c23f61
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as 'Pdf.Exploit.Agent-36874'. Heuristics indicate the presence of an XFA form and an AcroForm button with an action trigger, common vectors for PDF exploits. An embedded file stream was also extracted, suggesting the PDF is designed to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-36874 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36874
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off000008ed.bin
1e0cab60fa2a9ea351ab2ddef66349baea260695a0a041904521aeeaea31d45d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1476 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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