Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d775ab3a724c2b…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 77e85b67950855dee8de51d4443a7ab1 SHA-1: 87ee4507221c285e1f6bfd15e628557118338995 SHA-256: 15d775ab3a724c2b2cfba72e1436911eed5c8da67ac15cc67506764840ae3bfc
110 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36874, and a machine learning classifier also flagged it with high confidence. The presence of XFA form elements and an AcroForm button with an action trigger suggests exploitation of PDF vulnerabilities. While no specific script was extracted, the ML and ClamAV detections strongly indicate the PDF is designed to exploit a client execution vulnerability, likely delivered as a spearphishing attachment.

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
a69a4dd7bcb8ac60858f02c7f3145be9e6d8cc8e4d59546e1893cd3e196bd8b3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1442 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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