PDF malware analysis — malicious · 342fd03cdd952040

MALICIOUS

PDF

2.7 KB

MD5: 3a8753d00d4500d71fbf1aa5b747958a SHA-1: 4a2fd849b80ac3deda2a168ea746779785157446 SHA-256: 342fd03cdd952040223c4a2b2a78dc5ccafa2b7780629dd849440cb8245716ae

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode() for dynamic code execution. This script is designed to download and execute a second-stage payload, as indicated by the 'PDF JavaScript exploit cluster' heuristic. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it's a malicious document delivered as an attachment.

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` `1c51d5bf89ae15d624e87f0059f443d5d9b2e755f3319fdd28bd4ae08a2618fe`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2603 bytes
`javascript_obj111712_001.js` `e2fdd516f12b2052345701e94aaa6ec7bdf33aa29c0d61ad11216104d98d392a`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x8D4	529 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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