PDF malware analysis — malicious · 204f41fbd363ed1b

MALICIOUS

PDF

112.3 KB

MD5: 16ae067da457b44469c3c261ca23c2f1 SHA-1: 21ed6d1f66142742a7d2f04d1deff1e8c887feb9 SHA-256: 204f41fbd363ed1b6ffab0cdd08dd2ee6ee2dbd999fc22438f1a31f34189e068

132 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript and RichMedia (Flash) content, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA. The ML classifier strongly flagged this PDF as malicious. An embedded JavaScript file, 'javascript_obj0006_000.js', was extracted, suggesting it likely contains code to exploit vulnerabilities or download further payloads. The presence of ASCIIHexDecode and ASCII85Decode filters further supports the exploitation of PDF vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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 0xB97	55839 bytes
`javascript_obj0006_000.js` `d0d3d12ea14c226cf7fd82e7415be0ce01641b1d769f569cafd4864984227828`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF6	1407 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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