PDF malware analysis — malicious · 0658be6b33ff7f6a

MALICIOUS

PDF

573.9 KB Created: 2011-04-19 14:23:41 +08:00 Authoring application: Acrobat PDFMaker 9.0 Word 版 (via Acrobat Distiller 9.0.0 (Windows))

MD5: 562b57ec53c7b3107579d66d2648d915 SHA-1: 3daaec1ccf3c8db290cc643ae15865afcadd9112 SHA-256: 0658be6b33ff7f6afb372bc75b7017b55c6c14eb7c7c92e57aebc89da6f846d2

386 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript that exploits known vulnerabilities (CVE-2010-1297 and CVE-2009-0927) in Adobe Flash Player. The script is designed to download and execute a second-stage payload, as indicated by the critical heuristic firings related to JavaScript exploits and Flash RichMedia. The extracted JavaScript streams are heavily obfuscated but contain decryption routines, suggesting an attempt to conceal malicious code execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 12

Adobe Flash authplay SWF exploit in PDF — CVE-2010-1297 critical CVE likely CVE_2010_1297_FLASH_RICHMEDIA

PDF combines RichMedia Flash activation, a crafted SWF with ActionScript prototype/AVM-era markers or the AES-PHP/authplay variant markers, and PDF-side shellcode heap-spray staging. This is the static delivery shape associated with CVE-2010-1297 in Adobe Reader's bundled authplay.dll.
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. (identified after JavaScript deobfuscation)
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 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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`8.swf` `2aa862d005f88538e38f0035e72490ff3991361b263b95d6130145c16f6a7c8d`	pdf-embedded-file	PDF EmbeddedFile object 37 at offset 0x8CABA	2557 bytes
`javascript_obj0027_000.js` `154d6fe46ed8351b786698a48204ec3b29051283b3b72747dcc14199424ae167`	pdf-javascript-stream	PDF /JS object 27 at offset 0x8B994	12342 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `af5559b50f7c9e5a1c54946f2490b549a47bff2fc59a94771b05611b7b360b3d`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 27 at offset 0x8B994	11056 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`js_property_alias_stage_000.js` `f1ccf869c3e3d590fb54776c6133375fdd7e7a097147da32bc86f79e95194946`	deobfuscated-js	JavaScript property alias normalized stage at offset 0x8B994	11384 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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