PDF malware analysis — malicious · b617d6625b807def

MALICIOUS

PDF

37.8 KB

MD5: ac84f591938f9b4513879f396ce3e32b SHA-1: f4e76f66f9948665c01fd1ca364fb635a8a4fde7 SHA-256: b617d6625b807defe8fbcfda839bdd2950d9191c7a55307c2166ecaa7b3dabae

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript, a Flash object, and the use of string manipulation techniques like fromCharCode and ASCIIHexDecode. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript file, 'javascript_obj0006_000.js', is highly suspicious and likely contains code to download and execute a second-stage payload.

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 0xB01	55839 bytes
`javascript_obj0006_000.js` `01a4b986deea52c442a0e2615f968fd6ae7c637b48c7e6f54fdfd24c7315289e`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1636 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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