PDF malware analysis — malicious · 1144c8d9a883084d

MALICIOUS

PDF

4.0 KB

MD5: 6435daea4bc205900c589822099d7556 SHA-1: 1768277e3301687b694b812a67ce94999bdc7813 SHA-256: 1144c8d9a883084d0cc6ecb0574f75d35b0fad0539bb548e415c858cee72119a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains obfuscated JavaScript streams that utilize eval() and String.fromCharCode() functions, indicating an attempt to execute malicious code. The primary script appears to be a downloader, as suggested by the heuristic 'PDF_JS_EXPLOIT_CLUSTER' and the presence of large, complex JavaScript streams. The script's obfuscation and use of eval() are common techniques for evading static analysis and delivering further malicious content.

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` `a80b513f20ffcc19764f512b2010c0c77da01c8ad310cf5e4fc76fbc6b15a336`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `5eacf7579796edf3383c673c3bd20d5f84ac23869a27e3178f87144deed5fc86`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	5588 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.