PDF malware analysis — malicious · 0277fef0a26bce3f

MALICIOUS

PDF

17.0 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)

MD5: 431de530c8ef6436bdff5f96ae392111 SHA-1: e94cae53df17d406b96523eafd5f2b0c17b2541c SHA-256: 0277fef0a26bce3f7a3be327fa06e8aded3b2f3ed45090b24f4ab829e6566e18

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicating obfuscation and likely malicious intent. The JavaScript is designed to execute arbitrary code, which is a common technique for downloading and running further stages of malware. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a high-risk exploit.

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
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `909eefe944d6ec8be01527c2ea5fd7ea9ebb8ad2c248838dffffb8cc1a3dc881`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	6512 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0007_001.js` `24e3e73a5ba6f769f3ccb48f35b290e6e9e2089fc6b14fc96fc920d56852ba95`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	54 bytes

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