PDF malware analysis — malicious · 19ede741bad20ad4

MALICIOUS

PDF

16.4 KB

MD5: 1ab9428fcbf86e18d8bdbc207b2f896d SHA-1: a239c1b371deeca013a50681c7856fa8f421f9e2 SHA-256: 19ede741bad20ad4f1ff1f9d6e11ac852e62b88670cb4a794732d9bfcb803040

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness (0.999904). The JavaScript utilizes eval() and String.fromCharCode() for obfuscation, a common technique for downloading and executing further stages. While the exact payload URL is not directly visible due to obfuscation, the presence of these techniques strongly suggests a downloader or dropper functionality.

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. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `142a0108db0e8c5c3cec10a242a5c12823425e9820715fe250e9f187c24e1d71`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	299 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `c964afffc002640dc2a624477fbaca319f16a1fcad77600103dede6b2dcffc47`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B36	11773 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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