PDF malware analysis — malicious · b3bebf640598c3f4

MALICIOUS

PDF

37.7 KB

MD5: 318d878244154c9f22ee10a7c5884a9a SHA-1: 1ed5c64cbf0de76457d39d3e0d433f2ff35eda64 SHA-256: b3bebf640598c3f4f4ce5d7454a2ddcc320dda0c87b401821f08fdb800acb8e4

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and Flash content, and the use of ASCIIHexDecode filters with exploit indicators. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is highly suspicious and likely responsible for executing malicious code or downloading further 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
`Adobe.swf` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xAAB	55839 bytes
`javascript_obj0006_000.js` `dca15ef2087eec4e42d737c625b81ea22183c7c012e43bbfa424c8a29331ffd9`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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