PDF malware analysis — malicious · 78eec0b35290eb50

MALICIOUS

PDF

7.9 KB Created: 2009-07-13 19:22:54 Authoring application: sOY (via jsi)

MD5: 2fcbb18bffaf88f26eb9e08912616fe6 SHA-1: b4523376cbf94737c0f530265300507d96d23f9b SHA-256: 78eec0b35290eb50d23f390f87500349529a644b5e9640cb2d4a33c4007df45a

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains obfuscated JavaScript that utilizes the unescape() function, a common indicator of exploit code. The JavaScript is designed to download and execute a second-stage payload, as evidenced by the PDF JavaScript exploit cluster heuristic. The ML classifier also strongly indicates maliciousness.

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.
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.
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_obj0006_000.js` `ceecfabe7c97ce3e439a70e274c2e2efb21a3300d9d9e75d5cb1a057b1a80936`	pdf-javascript-stream	PDF /JS object 6 at offset 0x19D	318 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0006_001.js` `8f55d9b6ba7919ee3d36fcad56d0ef0f380d9565e16aa3789678917838622085`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1C5	7685 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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