Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b75a58b5916854…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 0c4c95026453d0beafcb63b8b43b1524 SHA-1: 4700648d733b19aaa760edb154fec1d4ea78b5f5 SHA-256: 73b75a58b591685480df51d42a225cf24e495dbd96f8b3da2158916543bdbf11
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV with the signature Pdf.Exploit.Agent-36874. It contains an XFA form and an AcroForm button with an action trigger, indicating it is designed to exploit PDF vulnerabilities. The ML classifier output of 0.999296 strongly suggests malicious intent.

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
81f79ed264472c211e1713108f1f9c2cb1197283ca0289418f8bb14e60989aa6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1483 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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