PDF malware analysis — malicious · dbe4da07b39fcc7c

MALICIOUS

PDF

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

MD5: 2792b44bdb2e508f422319951b0a9e94 SHA-1: 20b6d8648f050a766186e964c6e7b29d2e00757d SHA-256: dbe4da07b39fcc7c4925203cea416353010699007dcaf744c1b3911e29e60df7

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call within the JavaScript stream (PDF_EVAL) strongly suggests code execution. The ML classifier also flagged this PDF as malicious with high confidence. The extracted JavaScript file, javascript_obj0001_000.js, is the primary artifact, likely responsible for downloading and executing a second-stage payload. The use of String.fromCharCode further supports obfuscation techniques common in malicious scripts.

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` `365976b83f8acec72c98121a6c968b9f1dac1ce0d020bd46848d070301ab3275`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	988 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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