PDF malware analysis — malicious · b88bdfedf9d69dbc

MALICIOUS

PDF

37.7 KB

MD5: bff8ed87c415766c6195dd0cdb86c4d3 SHA-1: f4938513cf69a590a895b74afd7801267fd20fa0 SHA-256: b88bdfedf9d69dbc84f8a74b8f02b39fc1a06cc36e5354423885a4daac3f7e24

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1559.002 Component Object Model Hijacking

The PDF file exhibits multiple high-severity heuristic firings, including PDF_RICHMEDIA and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. An embedded JavaScript file was extracted, which, combined with the RichMedia content, suggests an attempt to execute arbitrary code or exploit vulnerabilities. The presence of PDF_JAVASCRIPT and PDF_JS further supports the use of JavaScript for malicious purposes. The ML classifier's output of 0.999988 strongly indicates maliciousness.

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 0xAA7	55839 bytes
`javascript_obj0006_000.js` `a4aee18a1ae9be857b0b8e4428176c2910801c64d276d2fd9ac74b53304823ca`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1564 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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