PDF malware analysis — malicious · 23940f00ebb09db7

MALICIOUS

PDF

111.2 KB

MD5: f2c157e93923f368f08dbf511cfa2051 SHA-1: 675ec19dae5dd14f9d2407c664ab9948ca6884dc SHA-256: 23940f00ebb09db7d729f29398740c15887f4c1533b9bfeb12d4db4ece071fe4

124 Risk Score

Malware Insights

MITRE ATT&CK

T1559.002 Component Object Model Hijacking: DLL Side-Loading

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and a Flash object. The ML classifier strongly flags this PDF as malicious. The presence of 'javascript_obj0006_000.js' and '20102884.swf' as embedded artifacts suggests an attempt to execute code or exploit vulnerabilities. The JavaScript stream, though potentially obfuscated, is a common vector for delivering secondary payloads.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`20102884.swf` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x72B	55839 bytes
`javascript_obj0006_000.js` `5f7ef457edcc2cb155249c1fefb3d5a41a00c23204fa603f6ef9c916df8d0da6`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF6	1440 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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