PDF malware analysis — malicious · f6c9ff14a9bc1728

MALICIOUS

PDF

112.3 KB

MD5: b0860e5636a35420a7fe65d905bc9d97 SHA-1: f438240b47ef904b5cdb792a369355ab792951dd SHA-256: f6c9ff14a9bc17285bbf9b16330219508e37570867f6734a881e10f794b4d482

132 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript and a Flash object, indicated by heuristics like PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA. The presence of obfuscated JavaScript, identified in EXTRACTED_FILE_STATIC_TRIAGE, suggests an attempt to hide malicious code. The embedded artifacts, '20102884.swf' and 'javascript_obj0006_000.js', are likely components of an exploit chain designed to compromise the user's system.

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` `59e3191102a0f480c5c194c5cb9b10d0a2c71b3bb599be9c1ce0dc84255b337f`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF6	1401 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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