PDF malware analysis — malicious · 0be9d7ef14448320

MALICIOUS

PDF

75.8 KB Created: 2010-03-17 04:18:35 Authoring application: mwvhpiY8JC2mO8 (via nS2iPTK9UBZ5)

MD5: 5e37d9431aac67887a2a8eff3bc35e57 SHA-1: 5feb5d03c82be1f178071c82f01bc5a489ce050d SHA-256: 0be9d7ef14448320ef1c27dfa425ece1d1449240472e53989fc17d51b56af8c5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode(), indicating obfuscation and potential exploit code. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript is highly likely to be responsible for downloading and executing a secondary payload, which is a common technique for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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_obj0007_000.js` `6b4de5d0590e2ec71774234dbf962824e2f63184a8547e39dfd7d45cacc26f5a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	76377 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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