PDF malware analysis — malicious · 5427fd34dcb9793d

MALICIOUS

PDF

9.5 KB Created: 2008-04-28 12:17:40 +03:00

MD5: a282ab76a123e329502fac4429371882 SHA-1: 024ae61c3888879a769c3be12368fab9218c975e SHA-256: 5427fd34dcb9793d9eefcecaa0a29d75144f3e16368459b227337563aed0c95b

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF contains embedded JavaScript, including an eval() call and String.fromCharCode usage, indicating obfuscated code execution. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript file, javascript_obj0016_000.js, is the primary artifact for further analysis, likely responsible for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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)
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/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0016_000.js` `511003748783a0adfe06f8324ed911bdf632a14fff9e38f1fcb7367e342d3755`	pdf-javascript-stream	PDF /JS object 16 at offset 0x931	7382 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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