Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19113b3b071b0a5…

MALICIOUS

PDF

5.0 KB Created: 9615-59-87 49:75:80 -30:87 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: 48ae4a783a21bfe515aa024c08aaf758 SHA-1: 610f473dea94916568952140fc2e7087692e7c70 SHA-256: c19113b3b071b0a56edaf786212e2c6358cf777cfb91fb41b7726309ccb8b266
158 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The ClamAV detection 'Pdf.Exploit.Agent-1635' strongly suggests a known exploit. The embedded JavaScript file 'javascript_obj0028_000.js' is the primary artifact, and its presence along with the exploit indicators points to a malicious intent, likely to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-1635 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-1635
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0028_000.js
81bf480eb29d9cb984146aab9789f50872b34bb8ed495fc01c397f051b942548		 pdf-javascript-stream PDF /JS object 28 at offset 0x4FD 2841 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).

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