PDF malware analysis — malicious · 11f5cb9f4e400d95

MALICIOUS

PDF

407.4 KB Authoring application: Python PDF Library 055 http072057057pybrary056net057pyPdf057

MD5: 931b0cf32854b5cf96e5c5a442e09b24 SHA-1: 4ca2c9224784755c4b13c24d011e1f80c5984dcb SHA-256: 11f5cb9f4e400d9532d6d53a04a53dc85b6934b156c049e140f7dcb0eca3333a

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript and rich media (Flash), strongly indicating an attempt to execute malicious code. The presence of a secondary embedded PDF further suggests a multi-stage attack. The ML classifier's high confidence score and the critical heuristic firing for a suspicious child PDF support the assessment of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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
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://adobe.com/AS3/2006/builtin

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`pushpro.swf` `f30a754153ec4fca6ea9fb770704c65d16bb94933b633b8d6ec5725c761d79c6`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0xB4F	772 bytes
`polyglot_child_pdf_off00064528.pdf` `5da99374b561b57aa146829d66bf751470dcded5972eb056126e4f96732ebf0e`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x64528	6297 bytes

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