PDF malware analysis — malicious · 7851970c69ccffb8

MALICIOUS

PDF

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

MD5: f5b3d47f2dc415088606b976183ab94b SHA-1: 4c12924f5d579ea11ca64b8d1aacc8796d82d622 SHA-256: 7851970c69ccffb88d6c45f86d89ef3c4ea262404d0bf5940d7ba4fb8552c1c6

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes the unescape function, a common indicator of exploit code. The script appears to be designed to decode and execute a payload, likely leading to further malicious activity. The ML classifier strongly indicates maliciousness, and the PDF JavaScript exploit cluster heuristic confirms the exploitation 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.
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` `7b55c1e70d151dd01815e956ab21fc15f470dfb4f3d58da5e1808933a8872a5d`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF68	163 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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