PDF malware analysis — malicious · 5c5c3e4cfce4b0bf

MALICIOUS

PDF

2.7 KB

MD5: 9780a569240a89f3cfb990e2501030e5 SHA-1: 5a3c00fb7378cfc419e9fd606e50786aaf9930d6 SHA-256: 5c5c3e4cfce4b0bf3c4cd3fef8c993a901f8061bb16ef051c0731b55015f0f0e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains obfuscated JavaScript, including calls to eval() and String.fromCharCode(), which are indicative of exploit code. The JavaScript is designed to decode and execute a second-stage payload, likely from a URL that would be reconstructed from the obfuscated strings. The ML classifier strongly flags this PDF as malicious.

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_obj111711_000.js` `63332bbeb2f9b35ff3ba07e0a272449d17a1d18c261dc674c3cb1b726262d96d`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2610 bytes
`javascript_obj111712_001.js` `856bb141e3177baa25367ab4ff132d08f59329d0cc1854a7bba8741a5ffa348e`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x8D7	545 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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