PDF malware analysis — malicious · 70b046a35321687c

MALICIOUS

PDF

4.4 KB

MD5: 8a97b2fbb126758b5288b196e5de93a4 SHA-1: 91ad05b1cc90d25988010ec23af4227f2afffa4f SHA-256: 70b046a35321687c3d2ad071f54567a889c05d00a201e94df9a7014a13be64b4

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that is heavily obfuscated using String.fromCharCode and character code arrays. The script's primary function appears to be decoding and executing a second-stage payload, indicated by the PDF_JS_EXPLOIT_CLUSTER heuristic. The ML classifier strongly suggests maliciousness. No specific family could be identified due to the obfuscation and generic nature of the exploit.

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_obj0002_000.js` `685e336b17a8256abf49e74d9f11918c7d8ce72b9e5b464af60fd61ec3855a75`	pdf-javascript-stream	PDF /JS object 2 at offset 0x7B	105925 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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