Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5486918b4cfd8a…

MALICIOUS

PDF

22.8 KB Created: 2009-05-06 20:45:24 +08:00 Authoring application: DocuCom PDF Core Library
MD5: 074e09c6936a03f8536755658be65d37 SHA-1: 73c81171859caa535ffa7a9f181dd4a1a9b7814a SHA-256: 1b5486918b4cfd8a0442c2f03249d007bf99527455fc818eaf23210cac5d0e4b
208 Risk Score

Malware Insights

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

The PDF file was flagged by multiple high-severity heuristics, including ML classification and ClamAV detection, identifying it as a dropper. Embedded JavaScript streams were found, and one heuristic specifically noted the use of unescape() for obfuscation. The presence of these indicators strongly suggests the PDF is designed to exploit vulnerabilities or trick the user into executing a malicious payload, likely downloaded from an external source. The ClamAV detections 'Pdf.Dropper.Agent-7235451-0' and 'Pdf.Exploit.Agent-35646' further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Dropper.Agent-7235451-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7235451-0
  • 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
47af198ffa4198d6da76f31f447d7263fae41b4bd59c9e700734d486ffcf63f8		 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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