PDF malware analysis — malicious · f4226dfacfb8bde6

MALICIOUS

PDF

417.2 KB Created: 2010-01-30 13:13:01 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)

MD5: f12e52d39e46be1cba10b72942be2006 SHA-1: 353bbed7fb06e00b805905e05a704b4a56e4ee2e SHA-256: f4226dfacfb8bde602cd91258d8d025c34d4ef7cae4fcb2f85b43079188e14f2

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file exhibits malicious behavior through embedded JavaScript. The heuristics indicate the presence of JavaScript actions, embedded JS streams, and a high-confidence eval() call, suggesting code execution. The ML classifier strongly flags this PDF as malicious. The extracted artifact 'javascript_obj0030_000.js' is likely responsible for the malicious activity, potentially downloading and executing a second-stage payload. The confidence is high due to the ML score and multiple heuristic firings, but the exact payload and family remain unknown.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 7

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.
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/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`PDF` `06e257095b5663de382e43f0a1bcc92337a1e5cbbcc8c5b977149b952e38fb69`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x105F	4788 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).
`javascript_obj0030_000.js` `648a6151c1e391feb35b8fe58daa975236dd53ba3085a78c3288fe2e61b650e7`	pdf-javascript-stream	PDF /JS object 30 at offset 0x5CB	60 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.