PDF malware analysis — malicious · 6b62d2cbf8ac9aed

MALICIOUS

PDF

5.1 KB

MD5: a58d437e2ddfe101e02c6cca27c984a6 SHA-1: 20d62d96294699d481fa2911f18c51e0c685d3b3 SHA-256: 6b62d2cbf8ac9aedc268cd37358ca899adf705e82ffb0de2ed4be05d4ad4a989

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() for obfuscation and execution. The JavaScript is designed to download and execute a second-stage payload, as indicated by the 'PDF JavaScript exploit cluster' heuristic. The exact nature of the second-stage payload is not discernible from the provided evidence, leading to an 'unknown family' classification.

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_obj53097_000.js` `b7b79ce3e8e8e98fddbb8bd58fd4eeaaebd185bec15750214ee6d6243a048d1a`	pdf-javascript-stream	PDF /JS object 53097 at offset 0x135	8369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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