PDF malware analysis — malicious · 851936810e6a978f

MALICIOUS

PDF

45.8 KB

MD5: b2059ca39ea201c0ebc6fc8ef568ed50 SHA-1: 9e650bf9494c3d19bb957f62217868567e381c01 SHA-256: 851936810e6a978f7431fc10008c42ee0d4d405f412ddc297ed16960520b291f

216 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file exploits known vulnerabilities in Adobe Reader related to U3D content (CVE-2009-3459, CVE-2009-3953). The embedded JavaScript, specifically the `javascript_obj0009_000.js` and `legacy_pdfkit_stage_000.js` scripts, is designed to be executed by the vulnerable reader. The scripts appear to deobfuscate and then evaluate further JavaScript, likely to download and execute a secondary payload. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

Adobe Reader U3D auto-activated 3D annotation — CVE-2009-3459 critical CVE likely CVE_2009_3459_U3D_AUTOACTIVATE

PDF contains a /Subtype /3D annotation that is configured to auto-activate on page view (/3DA <</A /PV /AIS /I>>) alongside a /U3D stream and JavaScript. This is the document shape used by CVE-2009-3459 (Adobe Reader U3D CLODProgressiveMeshDeclaration heap overflow, APSB09-15): the U3D parser runs without any user interaction once the page is rendered, while the accompanying JavaScript prepares a heap-spray to land controlled memory inside the corrupted allocation.
Adobe Reader U3D CLODProgressiveMeshDeclaration exploit critical CVE likely CVE_2009_3953

PDF combines malformed U3D 3D content with JavaScript/action activation. CVE-2009-3953 is an Adobe Reader/Acrobat U3D CLODProgressiveMeshDeclaration array-boundary vulnerability triggered by malformed U3D data in a PDF.
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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.

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `e2b34b75dcc0469a6f14d95a84adeee8b269034ea24b4719ad2ffc87470b98c8`	pdf-javascript-stream	PDF /JS object 9 at offset 0x489F	590 bytes
`legacy_pdfkit_stage_000.js` `04325ca6a5b627b71276556d1f57e00c778be16cd1066fff494c802a7313e518`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1C9D	12216 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `84b9c40c08e303e99acd69b59912ca2aab4c1da6482fc62b693ef073e5633c8c`	deobfuscated-js	PDF JavaScript deobfuscation pass	335092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004b0e.bin` `9ee983707edc4351a88e510e1ea40257b620aa8d1703a4e6b0401cfab3608352`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4B0E	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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