PDF malware analysis — malicious · 5c7ee97c3ebdf3a3

MALICIOUS

PDF

5.1 KB

MD5: 301646284b3eba79febdf5fe9a3d436c SHA-1: 949ccebb0fa8041f84c1ac0056a636308c86287d SHA-256: 5c7ee97c3ebdf3a31d334184892250dce070e41c857a46777d34b60434bc85bb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() to execute malicious code. This script is designed to download and execute a second-stage payload from the URL 'http://www.example.com/payload.exe'. The ML classifier strongly indicates maliciousness, and the combination of JavaScript execution and payload download points to a common malware delivery technique.

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_obj16309_000.js` `2fcd4136ac85c10b4f746dc0ac8c12f1ca4bcf9d3509b9bb0a2360d545ab1e29`	pdf-javascript-stream	PDF /JS object 16309 at offset 0x139	8361 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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