PDF / .COM malware analysis — malicious · 83076dafd8f564ab

MALICIOUS

PDF / .COM

2.7 KB

MD5: 2f3c61565137bf43f3d6c9561c440d34 SHA-1: 69d98354af1f07f4ddabe9e012f0d8ff98d28e43 SHA-256: 83076dafd8f564ab953f9c94c94639428fa80dfc127668287b4bb14d5654cef3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains obfuscated JavaScript, including eval() calls and String.fromCharCode, which are indicative of exploit code. The embedded JavaScript streams, particularly 'javascript_obj111612_001.js', are highly obfuscated but likely contain logic to exploit PDF reader vulnerabilities and download a secondary payload. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion of an exploit attempt.

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` `932016dacf30977ad4efd8b860400d02134484fee96cb96a5392bde2668d49ff`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `b373b64e329b898feedc336c26ee918b42d559ff9a0add48d7ba5465296534fa`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3309 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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