PDF malware analysis — malicious · 5d6ee291b370054b

MALICIOUS

PDF

8.2 KB

MD5: 68a408cde3974cb6346f0c7eeda68c04 SHA-1: 03c071c6da4a0c8de97422d6827dfe9bc7735b65 SHA-256: 5d6ee291b370054ba065b101261550ade5c89dc47b86e3386efa740bf3c4bd27

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() for obfuscation, a common technique for exploiting PDF vulnerabilities. The JavaScript decodes a Base64 string which, when processed, appears to contain further obfuscated JavaScript intended to execute malicious code. The ML classifier strongly indicates maliciousness, and the presence of exploit cluster heuristics confirms the exploitation 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `6f0acc179d204617f08667c326aa78eb33ea0b310519f50aa49da7d903f04fad`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	14471 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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