Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e38b120e911db7a…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 6a22331c52a0a7f8bfcbefbf3dee15c6 SHA-1: d70d318920aaacf6e9d67c93a25b3f407ed01f84 SHA-256: 6e38b120e911db7ae3d8e0ea244ad8e918b60cac3fc7c3fe27a768d48d1da7cb
110 Risk Score

Malware Insights

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

The critical ClamAV detection and ML classifier strongly indicate malicious intent. The presence of XFA forms and AcroForm buttons are common vectors for PDF exploits. While no specific script was extracted, the 'Pdf.Exploit.Agent-36874' detection suggests the PDF contains exploit code designed to execute arbitrary code upon opening, likely leading to a second-stage download.

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
ff9bc28468258620c2fe405db0d97954af749e8c0ad329b6354655e9eac0c728		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1460 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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