PDF malware analysis — malicious · 864d72c3821dd7b4

MALICIOUS

PDF

530.4 KB Authoring application: Python PDF Library 055 http072057057pybrary056net057pyPdf057

MD5: f6c28d531de0c997fda583d32d1f5dc4 SHA-1: 9fa3a49b6b8b4e1772332fca8cfcad2a662bd524 SHA-256: 864d72c3821dd7b412c2dfc59366eaa007185626f8bc019107d8996d5a343e8f

154 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious by an ML classifier and contained multiple suspicious elements including embedded JavaScript, an embedded file, and RichMedia (Flash). A secondary embedded PDF was also detected, which itself contained JavaScript and RichMedia, indicating a multi-stage attack. The primary purpose appears to be the delivery of this secondary PDF, which likely contains code to download and execute further malicious payloads. The presence of JavaScript and RichMedia points towards exploitation of browser or PDF reader vulnerabilities.

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` `5e8b92090afc1d9f8b703028aa20e64debf63c74b6db09f92633790c303e679f`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0xB4F	772 bytes
`polyglot_child_pdf_off00083131.pdf` `9cf928e7a31deec417f458f791bdfcb4b09c30717a17743f76f8fa694a2f37e1`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x83131	6297 bytes

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