Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf9f23e34079eed…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: da6d088ddea5d623bba68e9526da6d45 SHA-1: 1063b9012803b846895f656891dd25b6dcd2ba57 SHA-256: 6cf9f23e34079eed29030447572c4895f49fad58ca8fb54c7a913e46e3559ba6
110 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it exploits a known PDF vulnerability. The presence of XFA form elements and an AcroForm button with an action trigger further supports this. The embedded artifact 'stream_001_off000008ed.bin' likely contains the exploit code or payload. The detection name 'Pdf.Exploit.Agent-36874' suggests a known exploit targeting PDF viewers.

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
27943fb07e7b05c7fe94a868f2130d43ce5dfc865826c6f016e16acea5f2f314		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1428 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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