PDF malware analysis — malicious · 80b6e73d52584641

MALICIOUS

PDF

2.0 KB Created: 2010-08-08 16:03:21 +04:00 Authoring application: PDFill: Free PDF Writer and Tools

MD5: 466e7d9dd3ed17464512e6efe6969b83 SHA-1: 051d4478ceee753decc948be0323d2c1bef3153d SHA-256: 80b6e73d52584641e6a07e74c97cf03e1d66adbabb7b83b46c346f6f24276124

152 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 an unescape function, a common indicator of exploit attempts. The script attempts to perform a heap spray with shellcode, suggesting it's designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of JavaScript points to T1059.007. Given it's a PDF, T1566.001 is a likely initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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.
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.
External URI info PDF_URI

PDF contains an external URL action
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.pdfill.com
- http://www.pdfill.com)/S/URI

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `0df529a5cf1a67e0d84f4020d88f2cd646900026e4b2b30e53d8a646a45e65eb`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	345 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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