PDF malware analysis — malicious · 19172dfd70f5b70b

MALICIOUS

PDF

4.6 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: 345d21e02ec057766b2e0856f8cd303b SHA-1: e0f5f293949d3bbdf5b56722072f8f3e40474630 SHA-256: 19172dfd70f5b70b6664b6e714a9b844a273ba9586a8cb71b1a5e5efaa6cd016

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that utilizes the unescape function, a common indicator of exploit code. The script attempts to execute a payload via `app.setTimeOut`, likely leading to the exploitation of a client vulnerability. The ML classifier strongly indicates maliciousness, and the PDF JavaScript exploit cluster heuristic further supports this assessment.

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 (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.
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_obj0006_000.js` `d69627ce20eca5ab2365647f8a01fc3d68c7904464b7ce97a71caed1624c0d9e`	pdf-javascript-stream	PDF /JS object 6 at offset 0xFA2	159 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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