PDF malware analysis — malicious · 14663fc5ac64cead

MALICIOUS

PDF

4.5 KB

MD5: 6e1daaa2b36a002a46b39c945f333c9f SHA-1: cdfcd5999d248c5431f2d3595c87b26b0cd1d2b5 SHA-256: 14663fc5ac64ceada5bfab929b359a2321e23a6a3239c2eb0dfb2e861a1b8444

116 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, which is heavily obfuscated and utilizes String.fromCharCode to construct its commands. This JavaScript is designed to exploit a known PDF vulnerability, likely to download and execute a secondary payload. The ML classifier strongly indicates maliciousness, and the presence of JavaScript points to a common delivery method for malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `a8bb1a6d96b1978b584979251fadf45ea8df210daaeef2ab87d52bc153feaf7b`	pdf-javascript-stream	PDF /JS object 6 at offset 0xBAA	2437 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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