PDF malware analysis — malicious · 1c81096e2f11dc2a

MALICIOUS

PDF

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

MD5: 22a3b3971a3544bdeadd1df7dfeeffe7 SHA-1: e2cc359bc7edf250faf5ad5ce7ae8c9cdaa1da98 SHA-256: 1c81096e2f11dc2a5ed9b934b13b8d421dc05ab61d7c9ccff184b10ef52deaf6

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of a high-severity PDF_EVAL heuristic indicates the use of eval() for code execution, likely to deobfuscate and run the embedded JavaScript. The ML classifier also strongly indicates maliciousness. The extracted artifact 'javascript_obj0001_000.js' is suspicious. The script's purpose is to download and execute a second-stage payload, but the exact URL or execution method could not be determined due to obfuscation.

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` `b7e353c443da58ca29ee1d78c59c3cdea6c9001640fe98dde5bd36dabb9a0114`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	525 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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