PDF malware analysis — malicious · 5a6fb2b7c0478bc4

MALICIOUS

PDF

22.2 KB Created: 2010-07-25 10:32:51

MD5: 5473cc18d2f479f6307845e73e9775b8 SHA-1: cdc1b1a8a5013e101901d73f9dd5923a4e96b89b SHA-256: 5a6fb2b7c0478bc49186499a62bb8510c1eba09331a9403d4b61ea4772f892b7

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF document contains obfuscated JavaScript code that utilizes String.fromCharCode to construct and execute commands. The ML classifier and exploit cluster heuristics strongly indicate malicious intent. The script's primary function appears to be the execution of a second-stage payload, likely leveraging the 'Exploitation for Client Execution' technique.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `b492824b64ffcc66780a4d9fb7743fae8a0f3c8aa2e25552da2ac1023a144e1a`	pdf-javascript-stream	PDF /JS object 1 at offset 0x5687	374 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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