PDF malware analysis — malicious · 6c6ee58d01f73108

MALICIOUS

PDF

9.5 KB Created: 2009-05-06 20:45:24 +08:00 Authoring application: DocuCom PDF Core Library

MD5: f5678b139a2eabd3423f95d47801eb79 SHA-1: ad1b35d8cf391d54677be6d037f779f775341a39 SHA-256: 6c6ee58d01f731083e1016d180a1d6a52b7909ba83e6c11a8abfbab179f3a373

310 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 is heavily obfuscated and utilizes unescape functions, indicating an exploit attempt. The critical heuristic firings for PDF JavaScript exploit and ClamAV detection confirm its malicious nature. The JavaScript is designed to download and execute a secondary payload, as evidenced by the generic stage recovery scripts.

Machine Learning

Nyx PDF Classifier malicious score 0.9988

Heuristics 9

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.
ClamAV: Pdf.Exploit.Agent-35646 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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.
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.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0003_000.js` `3a63aa1468610780740c9dc83aeeec5b08cb097e75c7162b2fbf08d5be27c95c`	pdf-javascript-stream	PDF /JS object 3 at offset 0x883	7299 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `7e27c9dd3f52261d7c8018838b81bf9d134d85c09f1c213544554b371747af66`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 3 at offset 0x883	5781 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `5d41a6961f14341c702c65e133d441c8d420b9c7dbb42e1a9f08b42b606dd5c6`	deobfuscated-js	generic stage recovery split-literal-normalize -> split-literal-normalize from JavaScript object 3 at offset 0x883	5778 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `ee7394fb02b35ec856df28f2593b5311bb4a174dfa533c756dd1aa5818511382`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 3 at offset 0x883	5773 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_003.js` `c50bc78d2ca0cbe32e2c9db770b8284aaf7cb60932d2f29852f21b4812b49681`	deobfuscated-js	generic stage recovery split-literal-normalize -> split-literal-normalize -> percent-decode from JavaScript object 3 at offset 0x883	5770 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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