PDF malware analysis — malicious · 171d3066221549aa

MALICIOUS

PDF

575.8 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: 5d926a902facb3c0bfc27e764a493917 SHA-1: fd2420a24b037fea318df7260aae9a73e41329d0 SHA-256: 171d3066221549aafb1a19ddd4af5bd827f60a8746801cfe82aa65c0697a1c4c

386 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript that exploits known vulnerabilities (CVE-2010-1297 and CVE-2009-0927) related to Adobe Flash Player. The JavaScript is designed to deobfuscate and execute shellcode, which is a common technique for downloading and running further malicious content. The ML classifier strongly indicates maliciousness, and the presence of exploit-related heuristics confirms the attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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://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 0x8D258	2557 bytes
`javascript_obj0027_000.js` `154d6fe46ed8351b786698a48204ec3b29051283b3b72747dcc14199424ae167`	pdf-javascript-stream	PDF /JS object 27 at offset 0x8C132	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 0x8C132	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 0x8C132	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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