PDF malware analysis — malicious · 09c3b27fee759da1

MALICIOUS

PDF

2.8 KB

MD5: 58b8a85e35106e1917e5f3dbb541bbe3 SHA-1: d407813276d6ca79607f11c3edf451d392089409 SHA-256: 09c3b27fee759da1ae813b0e6a4b180c5b67cae808adc0e20986e2bb9e17b7fb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicating obfuscation and likely malicious intent. The JavaScript streams, particularly 'javascript_obj111612_001.js', are highly obfuscated but appear to be designed to download and execute a secondary payload. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it's a downloader.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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. (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_obj111611_000.js` `a5823839b6e454a6cef0efc3bc5c4390776338e200390b1dbde26e7da8c8ab5c`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `073dd14aef425e3003f31375b9d56ea412065659922ad0c910be94925437b385`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3294 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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