PDF malware analysis — malicious · 4bf28e72dcee4554

MALICIOUS

PDF

37.7 KB

MD5: af7eb5c633acee0b469c9f1203ac6d8f SHA-1: f4f92a0e62a4d1f2cae99b9ca9ae3438ac75c62f SHA-256: 4bf28e72dcee4554da6518ef9cfdf4f6d1cbef7fb6e0dcf9547a457b0a113f9c

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file exhibits multiple high-severity heuristic firings, including embedded Flash (RichMedia) and JavaScript. A machine learning classifier also flagged it as malicious with high confidence. The presence of an embedded JavaScript file, 'javascript_obj0006_000.js', suggests an attempt to execute malicious code. The combination of these factors points to a likely exploit delivery mechanism, potentially leveraging vulnerabilities within the PDF reader or Flash player to download and execute further stages.

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 0xAC3	55839 bytes
`javascript_obj0006_000.js` `31c85c6b9f8490f7964580e8ce957f84b0e803a85a9b5b615cf1e8da4c1902de`	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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