PDF malware analysis — malicious · 5a56c2b0f0e7a942

MALICIOUS

PDF

5.8 KB Created: 2009-09-05 12:48:00 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: c6982b477a9cdf53371982246f597a24 SHA-1: 28cbc04993a10362fbf0fd1dc9cd78b49d416773 SHA-256: 5a56c2b0f0e7a9427e0c4278cf44f571fab477006b1ec17fff6d71a430eb6bf2

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file that contains embedded JavaScript, flagged by multiple heuristics as a potential exploit. The JavaScript uses `unescape` and `String.fromCharCode` functions, indicating obfuscation and dynamic code generation. The primary function of the script appears to be downloading and executing a secondary payload, as suggested by the exploit cluster heuristic and the ML classifier's high confidence score.

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0013_001.js` `6ac9e467f592cb77b992a44d286cf8e84856d20591eda9314e4b9f7c26bf4319`	pdf-javascript-stream	PDF /JS object 13 at offset 0xBFC	9972 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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