Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f50cf0c437b116c…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: eb913b296fe6cffb0ff4b2d6b9d4b2a8 SHA-1: 2f5ee8891085a00e5dc3266f1e7f8d9e57502c6b SHA-256: 0f50cf0c437b116c129639b0233040ea5a95d4ca2a07ea8321212e520125cf4e
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, with heuristics indicating an XFA form and an AcroForm button with an action trigger. These elements, combined with the detection name 'Pdf.Exploit.Agent-36874', strongly suggest exploitation of a PDF vulnerability to achieve code execution. The presence of a suspicious extracted binary stream further supports the likelihood of a secondary payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
08a59e1a5f36ab41fbd36d3f6e1bbbc0e46160e80f69ed3fb72e5e87e6c2b984		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1462 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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