PDF malware analysis — malicious · 6b373fd5a2269c43

MALICIOUS

PDF

208.7 KB Created: 2008-04-23 16:42:36 +08:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0 (Windows))

MD5: 63d5aed561c9726a18cd4e68e4f7c12b SHA-1: 4c4072e0febff2b5534e3dd624f8fe7972be13a5 SHA-256: 6b373fd5a2269c4340e04a30e7acec62b517be71bf8bb0d5a6011299994421c3

446 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits CVE-2007-5659 (Collab.collectEmailInfo) to download and execute a Windows executable payload. The embedded JavaScript is heavily obfuscated, but static analysis indicates it is designed to retrieve and run a secondary payload. The presence of an embedded PE file and multiple JavaScript exploit heuristics strongly suggest this is a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 13

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (matched in decompressed stream)
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.
Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/pdfx/1.3/
- http://ns.adobe.com/photoshop/1.0/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ctfmon.exe` `48e449f1dbb36c155ae86f1f9556fa905354655ba2d3a3b3188608684d5423c1`	pdf-embedded-file	PDF EmbeddedFile object 29 at offset 0x1067	15228 bytes
`javascript_obj0026_000.js` `05a4009a6e508138338e4310d4d605024c3e2541696b1cc30856f02b277153a5`	pdf-javascript-stream	PDF /JS object 26 at offset 0xA98	3441 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 17 eval/decoder/string-building token(s).
`javascript_obj0026_001.js` `b7e3004b293723fe7cc3d33876fbb2c77e92fda615855a65d2338dc64c3f0feb`	pdf-javascript-stream	PDF /JS object 26 at offset 0xACF	3382 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `54e056a4f2e6accf7870c2cd9351ce9999f1bda2bc2265da50cc13c72b2cb5c3`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 26 at offset 0xA98	3427 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 17 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `bfb09aaa0532169d0a7b2ffd451f5da0626d74ee06d72e9a1f26e966fcc3b74b`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0xA98	6810 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 33 eval/decoder/string-building token(s).
`combined_document_js_000.js` `e96b8afa9efde3892b18f660d82d65b32024fc94a3234e62c2cda712941e4405`	deobfuscated-js	combined document JavaScript streams at offset 0xA98	6824 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 33 eval/decoder/string-building token(s).
`polyglot_child_pdf_off0002ee66.pdf` `a42b42bc23d6ebbdf518c9e09aa9d65b3c29bda83095cf3f2a7ad65d458251fc`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x2EE66	21603 bytes

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