PDF malware analysis — malicious · 7d6c2ed861389f91

MALICIOUS

PDF

5.1 KB

MD5: fca99173c1bfdc8dd9f85f757596dd1c SHA-1: 442c24059b3e4cc62c5ae7aae7a2a9fe9487de7c SHA-256: 7d6c2ed861389f9197f7f5c3a1207ae78e6b2d713a72e74e16b635d23b9063a7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() to decode and execute malicious code. This script is designed to download and execute a second-stage payload from a remote source, as indicated by the exploit cluster firing and ML classification. The embedded JavaScript file 'javascript_obj741253_000.js' is the primary artifact of this malicious activity.

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_obj741253_000.js` `a849e5e291e0a5b19d709446bece929f7305c06228597fa02580dc1acea71319`	pdf-javascript-stream	PDF /JS object 741253 at offset 0x137	8352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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