PDF malware analysis — malicious · 0d40f68773193b0f

MALICIOUS

PDF

335.5 KB Created: 2009-09-29 17:28:27 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 6.0 (Windows))

MD5: 270ea1808ec66b4dd74b397254e57ce2 SHA-1: 7ebe7409a5759158a677dc191218c2777c20fe03 SHA-256: 0d40f68773193b0ff870332e11c525d3e64ee4a993c971c1d9badb95a52616f9

512 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 leverages multiple CVEs, specifically Collab.collectEmailInfo (CVE-2007-5659) and Collab.getIcon (CVE-2009-0927), to execute code. The JavaScript is designed to collect email information and appears to be part of an exploit kit aimed at compromising Adobe Reader. The primary function of the script is to exploit these vulnerabilities for client-side execution, likely as a precursor to further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9790

Heuristics 13

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (matched in decompressed stream)
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)
Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH

A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
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: 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.
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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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/pdf/1.3/
- http://ns.adobe.com/iX/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
`javascript_obj0030_000.js` `f6665a2b917420327cee75bc3142d96cc4e67dd9009946b609277cbcc4f01729`	pdf-javascript-stream	PDF /JS object 30 at offset 0x4F9D	5079 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: unlikely
`javascript_obj0051_001.js` `2b11dd708aa56c68c96f9840aad20b570c8c1d2a148d2baf32bd6974f8029b8b`	pdf-javascript-stream	PDF /JS object 51 at offset 0x5271E	5499 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `eaad06f4e88ea7ac410811174aa1d4cdd517506713602d636c3dd87a32727ebe`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 30 at offset 0x4F9D	5071 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: unlikely
`generic_stage_recovery_001.js` `5be6666d04dac2225a96708cf98249e79c3c5c47360ac819b7173f47540d72d2`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x4F9D	10563 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `7098d7f1d5d4111a540b6e17ab7226f3600b8452c7bd341d4ac18b2b0fdd62b4`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 51 at offset 0x5271E	5491 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`combined_document_js_000.js` `44ac5e8a59fa4a21951736daa0989199b9cbbc3f4838a38e880735393173d40e`	deobfuscated-js	combined document JavaScript streams at offset 0x4F9D	10579 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`polyglot_child_pdf_off0004bdcb.pdf` `1c6ce7a783be0494a1d54d06964f2958653bbb74017349b569d4c8659eeb8bee`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x4BDCB	32828 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: unlikely

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