PDF malware analysis — malicious · 2a69ce57d3cbbcb0

MALICIOUS

PDF

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

MD5: 09b750bf94c372e3edd86a6460d3996c SHA-1: 083682d78424162af7a93fd7b64b8f3811a929af SHA-256: 2a69ce57d3cbbcb08c5837d5af4a44b3c4ebfb1f65f8e01b09386b942ffd3e45

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream utilizes `String.fromCharCode` and `eval()` for obfuscation, indicating an attempt to hide malicious code. The ML classifier strongly suggests maliciousness. The primary function of the embedded JavaScript appears to be the execution of obfuscated code, likely to download and execute a second-stage payload. No specific family could be identified.

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` `eac57a40818dbc8a8533980ee90a89f9d7f0bf6c0d29a1f6138ef3fcad96b6bb`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	529 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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