PDF malware analysis — malicious · c8ee2902afb0b602

MALICIOUS

PDF

37.7 KB

MD5: f20cfcc2c3236d816e3cc1049b9e7dab SHA-1: fe3cc6360e6df041bc783bcea3ef5ab09c095ed2 SHA-256: c8ee2902afb0b60228b15e8e80ec68d5fcc1de9897078ff8745763a9939c5a17

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. The ML classifier strongly flagged it as malicious. The presence of a JavaScript stream and an embedded SWF file suggests an attempt to execute arbitrary code or exploit vulnerabilities within the PDF reader or Flash player. The extracted JavaScript file, 'javascript_obj0006_000.js', is a key artifact that likely contains the malicious logic.

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 0xABD	55839 bytes
`javascript_obj0006_000.js` `5437aaf04cbb60298d7a3eccd3d77f98882f0e8e423df2fdcc26e4ddd0e662a8`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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