PDF malware analysis — malicious · 20a60e01f2f3a09c

MALICIOUS

PDF

27.0 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: a250e253387308cd2a2fcbf126dc8452 SHA-1: f91b1af2eaac7e02a90bf7e10c5f9d6198780b01 SHA-256: 20a60e01f2f3a09c71faff09a65bc33460e3dbaa17f5744dceb99992a7c01994

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes String.fromCharCode and an eval() call, suggesting obfuscation and arbitrary code execution. The ML classifier strongly flags this PDF as malicious. The primary attack pattern involves leveraging JavaScript within the PDF to execute malicious code, likely to download and run a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `2a1da291679078bc8cda503eb50028a3af41e28e75e4e3b59550aa2927d95146`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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