PDF malware analysis — malicious · 1655570d20c8b26a

MALICIOUS

PDF

9.3 KB Created: 2009-20-42 30:25:00 Authoring application: About Alive (via Able Above)

MD5: d7b8a8287d9b079dcc538558c0428245 SHA-1: fc1d6f50855c95e89bf5f3fff9d0a7deafdf7b1e SHA-256: 1655570d20c8b26aaecd9867257523a92970a4413d367b121bea7e2172c03905

116 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_JS_EXPLOIT_CLUSTER'. The ML classifier strongly flags it as malicious. The JavaScript is heavily obfuscated and truncated, but its presence and the exploit cluster signal suggest it's designed to download and execute a second-stage payload. The authoring application 'About Alive' is also noted.

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. (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_002.js` `96465139f3a5cde9fe8372103f820ad3348ac6a3d3fff6f91ab6d81147a758f7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x38B	58558 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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