PDF malware analysis — malicious · 168f5c1482a794ad

MALICIOUS

PDF

5.1 KB

MD5: 4e851802de04e66668eb2bf5d326591e SHA-1: 8ab9c9f4a88f79612d763fb5849f058cdd9ccdde SHA-256: 168f5c1482a794ad2a32a0d436e15b5af709bd3e68354ebeb11ebac5816293db

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript which is heavily obfuscated but appears to contain logic for downloading and executing a second-stage payload. The script uses eval() and String.fromCharCode, common techniques for obfuscation and execution of malicious code. The ML classifier strongly indicates maliciousness, and the presence of JavaScript points to a downloader or exploit loader.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj86917_000.js` `1da87a5d44b462f817d4b5254783e96b5e5dc1affffcad3fbf1b7aff2791f0f7`	pdf-javascript-stream	PDF /JS object 86917 at offset 0x139	8375 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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