PDF malware analysis — malicious · ede09836b15b4266

MALICIOUS

PDF

15.2 KB

MD5: bbffbb695e49522b370a978a282f4e58 SHA-1: 5fa7e580190be27373f98f28cc26bbc9273cb618 SHA-256: ede09836b15b4266c581c5a58de9ad35bffdc3ef873620a72b4809e1656f17b1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream, particularly the deobfuscated version legacy_pdfkit_stage_000.js, utilizes eval() and String.fromCharCode, suggesting it is designed to download and execute a second-stage payload. The ML classifier strongly flags this PDF as malicious. While the exact payload and delivery mechanism are not fully discernible due to obfuscation, the presence of these techniques points to 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` `6a6f07353f7a4b5a9fc6c330bd4c128862c81ab57289be4e598bc66f6ae02ab2`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	315 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` `42077b420102e9cffdc93539ce92409eefe278adc8f70b28e8ef1bc5b5817e8a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1939	12036 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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