PDF malware analysis — malicious · 70c82f4f9133763a

MALICIOUS

PDF

7.2 KB

MD5: c9b29707fd843e6d6e87d8e5772e8f2f SHA-1: f2649d59fb7931d1664c22a433ad7c8501f435f5 SHA-256: 70c82f4f9133763a69e060f52df256c01c7eb1ff546f89b1a7ce2193eac8a6a2

196 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes unescape() and heap spraying techniques. The script appears to be designed to download and execute a secondary payload, likely the embedded 'exploit.swf' file, which is a common method for exploiting PDF vulnerabilities. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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
`exploit.swf` `ab4104ada9b5b26f382dd236a7c86c2334bce8da7900607b2d895a8d5d14805b`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x4D4	3764 bytes
`javascript_obj0017_000.js` `8bb72edfd76c83353fe8757b0a04c58de346ee2731911218acce0c3a0e651d4f`	pdf-javascript-stream	PDF /JS object 17 at offset 0x143C	1697 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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