PDF malware analysis — malicious · 711ca35965c4952a

MALICIOUS

PDF

2.8 KB

MD5: f82b87550069d5dea0ef119fd1841b6e SHA-1: 8042657149bfd0d8183eaba19125fab2b43b0a50 SHA-256: 711ca35965c4952a23c5d5d62ba02ede23dc66e961bf232063a1300f3cd1c166

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() functions, indicating an attempt to hide malicious code. The embedded JavaScript is designed to download and execute a second-stage payload, as evidenced by the exploit cluster firing and the ML classifier's high confidence. The specific URLs or hosts for the second-stage payload were not directly extractable due to obfuscation.

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_obj111611_000.js` `0c780f11d71c2d550dce5a8e9d053f3364bb1a377b35f06e19074c6a403ad175`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `5df929479fd15633ffd3045af5def8d7ad52ad0ad985c0568eddb6648c4792b7`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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