PDF malware analysis — malicious · 9fbaf6bc287810bf

MALICIOUS

PDF

37.8 KB

MD5: dc35cb39138c5b39ad8e7c6511b19a8f SHA-1: 07a21f7ba37d081ebf5596600a8b5d9853da08e1 SHA-256: 9fbaf6bc287810bffc05750b9160e02541fa1792effd6c821f1b2ea943d9a10e

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and Flash content, and a high ML classifier score. The presence of a JavaScript stream and embedded SWF file suggests an attempt to execute arbitrary code or exploit vulnerabilities. The heuristic firings indicate the use of JavaScript actions, embedded JS streams, and potentially exploit-related filters. The extracted artifact 'javascript_obj0006_000.js' is a key indicator of the malicious functionality.

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 0xB07	55839 bytes
`javascript_obj0006_000.js` `a25308bc25f77ddf9abe7c357096c470b25df1d83521ded9b7133661869ae358`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1648 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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