PDF malware analysis — malicious · 7d6f4aa88a72663f

MALICIOUS

PDF

37.7 KB

MD5: 38e2b51ddaf0a0095c1e4a4f4081d63c SHA-1: c68d17d9b49513813786fd6e8b5928c2ac3891ea SHA-256: 7d6f4aa88a72663f9955f0064933ffc232e7a35fc0178362bf4ffc3ea438dcc0

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript and Flash content. The presence of JavaScript, particularly when combined with ASCIIHexDecode filters and embedded files, strongly suggests an attempt to execute malicious code. The extracted JavaScript file, 'javascript_obj0006_000.js', is likely responsible for further stages of the attack, such as downloading additional payloads or exploiting vulnerabilities.

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 0xABB	55839 bytes
`javascript_obj0006_000.js` `4250c3ece108b42d9006fdd4248512b6bced91e5c0bc67f8257689fdbd38326f`	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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