PDF malware analysis — malicious · f4a0b7ea24f8ece4

MALICIOUS

PDF

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

MD5: abf01a990290e94ab2c76a1f41fa3981 SHA-1: 6a7a13b28e59eb2120637ad4a1df321bafc6cbe0 SHA-256: f4a0b7ea24f8ece41adc3ef798aed86e179879318c2926fb79743a416aafe8d9

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream utilizes `eval()` and `String.fromCharCode` for obfuscation, a common technique for executing malicious payloads. The ML classifier strongly flags this PDF as malicious. While the exact payload is obfuscated, the presence of `eval()` suggests dynamic code execution, likely to download and run a secondary stage.

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` `4bc0074a521b020f42df01a65ee9e625cb1515453e2dee6f116c8d11f9add83f`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	807 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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