Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd1a5731f70dbf7…

MALICIOUS

PDF

592.9 KB
MD5: f32aa81676c7391528afe08e437765cc SHA-1: 6045554853a61681d7264260cdd1072bbdc113ac SHA-256: 0bd1a5731f70dbf77c03e09822e2b3d68a4f25064baff7371f281410114fc936
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by heuristics as an exploit cluster and flagged by ML classifiers and ClamAV as malicious. The JavaScript is obfuscated but likely functions to download and execute a second-stage payload, as indicated by the 'Pdf.Dropper.Agent-5684015-0' ClamAV detection name. The presence of JavaScript and exploit indicators points to a common malware delivery technique via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Pdf.Dropper.Agent-5684015-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-5684015-0
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://reporter.mozilla.org/privacy/
    • http://reporter.mozilla.org/service/
    • http://getfirefox.com/releases/
    • http://en-US.start.mozilla.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official
    • http://www.answers.com/main/ntquery
    • https://addons.mozilla.org/searchplugins/updates/answers.src
    • https://addons.mozilla.org/searchplugins/updates/answers.png
    • http://www.google.com/search
    • https://addons.mozilla.org/searchplugins/updates/google.src
    • https://addons.mozilla.org/searchplugins/updates/google.gif
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://home.netscape.com/NC-rdf#
    • http://www.mozilla.org/unix/customizing.html#prefs

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj1054_000.js
b77987ebbbc9d5466f77aac85bec69019c472ab6bf367e31245a125942ad9996		 pdf-javascript-stream PDF /JS object 1054 at offset 0x29 84010 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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