Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cabc391fcc7d7b3…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 66b3e6451b470ad3998ca6eaa36a444d SHA-1: 6a7a74125ddef9a7e44c4c39c432df23edfa068a SHA-256: 6cabc391fcc7d7b37d1cabfc06562075e34506b2ef3986cb0cdc0fd2f5fa8c87
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV with the signature Pdf.Exploit.Agent-36874. The presence of XFA form elements and an AcroForm button with an action trigger suggests an exploit is embedded within the PDF structure. The ML classifier's high confidence score further supports the malicious nature of the file, likely leveraging an exploit to achieve client execution.

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
58c612cc624c1e068ec5d2ed4f2d238f4be0e96d4cd4eab2f3aacb5fb7d3074c		 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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