PDF malware analysis — malicious · 7a4157409cd1f10f

MALICIOUS

PDF

77.3 KB Created: 2010-03-16 00:18:25 Authoring application: xkoPuN8j56P9L (via gVHvT7)

MD5: bb68ae8b7e5f908e3f78eb70a00bee5f SHA-1: d5b57c02d1f01711f293ccd528f8f78bf76f095b SHA-256: 7a4157409cd1f10fed25a16116a6d3335c85c30164219668f521d2bed9eff199

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains obfuscated JavaScript that utilizes `eval()` and `String.fromCharCode()` functions, indicating an attempt to hide malicious code. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript is designed to download and execute a second-stage payload, as evidenced by the exploit cluster heuristics.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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_obj0007_000.js` `8a8c58803b7a0f2f268a1170acd34e1b91fbb8ecba46ec6109188a148c55372d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23C	77894 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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