PDF malware analysis — malicious · 3ebcb2160a968f09

MALICIOUS

PDF

32.7 KB Created: 2010-04-01 02:21:37 Authoring application: gRpqkbevAzsQmM (via sHlDVMpAFvMIKfGyJXCA)

MD5: d83f2f8850b3da386deb98397f37c4a8 SHA-1: e71220f7c5fba9082f32db75ab43f51f6620c047 SHA-256: 3ebcb2160a968f09464e2d14db61b5c0ff79e969ed0e1f1fd124c65934db68e5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript, named 'javascript_obj0021_000.js', is likely responsible for downloading and executing a second-stage payload. The presence of eval() calls and string concatenation in the JavaScript suggests obfuscation to hide its malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0021_000.js` `672957800b19b8b9132b1db01315d7dbf7c8b77b1ff98ccd6510a2d59a0259d3`	pdf-javascript-stream	PDF /JS object 21 at offset 0x3E22	16449 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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