Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dd1c0da503736a…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 7fd3273a94d75e9f0b9655c9c0da01b4 SHA-1: 310813aa23f5e9fc31ec42fea90bd483a8edf198 SHA-256: 88dd1c0da503736a509ef68999736f3728208e7e385c32425a647ebdb314511a
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

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 forms and AcroForm buttons with action triggers suggests an exploit is embedded within the PDF structure, likely leading to client-side code 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
750f86085d64b974a5ca9d038a053a2a2747acb389e916a11cefe1bd980f1afd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1418 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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