PDF malware analysis — malicious · 7e7c67aab6744f77

MALICIOUS

PDF

5.2 KB Authoring application: Python PDF Library 055 http072057057pybrary056net057pyPdf057

MD5: f5baa6915f5354f97ad5982ce5fc0059 SHA-1: 54240f0a3ed5c756421834368c8d034a50f79543 SHA-256: 7e7c67aab6744f77c19a8bca117968ac63079a1f5caeb3bf65fb72d164c09259

144 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' firings suggest the JavaScript is obfuscated and likely uses eval() and String.fromCharCode() to execute malicious code. The 'PDF_U3D_CVE_RELATED' heuristic points to a potential exploit targeting 3D content handling in PDF viewers. The ML classifier strongly flags this PDF as malicious. The primary attack vector appears to be leveraging a PDF vulnerability to run arbitrary JavaScript, which is then likely used to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
Additional-actions dictionary low PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0010_001.js` `95cc618fe0ec836f68fd52688b621569dc9f2c48c6f5f9e55d918cf18308e1ac`	pdf-javascript-stream	PDF /JS object 10 at offset 0x5A2	848 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0012_002.js` `3853e9b28e9408690ffa4077aade34f9dec3fdf59b44fe5f024aa070e9f1a24a`	pdf-javascript-stream	PDF /JS object 12 at offset 0x7D3	17644 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`u3d_00_off00000773.bin` `10f425ab28530353f9c611ca750bad6ce90a82ec98fb936f822bf820c0751e1e`	pdf-3d-stream	PDF U3D 3D stream at offset 0x773	276 bytes

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