Malicious PDF — malware analysis report

Static analysis result for SHA-256 5746e35b1c8746b7…

MALICIOUS

PDF

22.8 KB Created: 2009-05-06 20:45:24 +08:00 Authoring application: DocuCom PDF Core Library
MD5: b7f5ebfc4d5da74038883a466eceddf5 SHA-1: 040c4aaf505b3c42e482bd81788528de466fe8b9 SHA-256: 5746e35b1c8746b7fa034b870d9091ffaffe0e0353f81796de0f0427fae29582
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-35646, indicating it contains an exploit. Static analysis revealed embedded JavaScript streams and an unescape() call, common techniques for obfuscating malicious code within PDFs. The ML classifier also strongly indicated maliciousness. The primary intent appears to be the execution of a second-stage payload via the embedded JavaScript, though the exact nature of the payload is not discernible from the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-35646 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0003_000.js
3a63aa1468610780740c9dc83aeeec5b08cb097e75c7162b2fbf08d5be27c95c		 pdf-javascript-stream PDF /JS object 3 at offset 0x883 7299 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).
javascript_obj0026_001.js
9f4205698db81f076dbed1488457b6e3af3c1572660f2ccb216f1ac425060695		 pdf-javascript-stream PDF /JS object 26 at offset 0x20D6 14600 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: unlikely

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