PDF malware analysis — malicious · 8fdb121fbf8c63b5

MALICIOUS

PDF

44.7 KB

MD5: ffa60e080fd65db37599fce2f0a53ea3 SHA-1: 874b8afe876c110369e9d60b41902536ef668fa4 SHA-256: 8fdb121fbf8c63b5c7112b093ad869ecdcdd53b521f6fb7567100355de003ca5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and a U3D (3D content) object, which is a known indicator for exploits targeting Adobe Reader vulnerabilities. The ML classifier strongly flagged this PDF as malicious. The extracted artifact 'deobfuscated.js' suggests that JavaScript is used to perform malicious actions, likely downloading and executing a second-stage payload. The presence of a U3D reference at offset 0x467B further supports an exploit-based attack vector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `13e428efbba6d9f497c253ef53ac3f08561c5f9f3f489b4e0fd8def3952ba1fd`	pdf-javascript-stream	PDF /JS object 9 at offset 0x4452	539 bytes
`deobfuscated.js` `5e8b375f719a85a77e24267da2f7e95b6e393054265749c06a49b238ff04186d`	deobfuscated-js	PDF JavaScript deobfuscation pass	314995 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000046b4.bin` `a96e1fca2499edf504d3934052ca1fc338d4b4898a65e6a361937ed1ba0dc0fe`	pdf-3d-stream	PDF U3D 3D stream at offset 0x46B4	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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