PDF malware analysis — malicious · 95ff6d73ad8adca9

MALICIOUS

PDF

37.7 KB

MD5: d89b08ba4711a3759f37c12bffe6db9f SHA-1: 64994265315cc9a855864a2d4a70b1948a617196 SHA-256: 95ff6d73ad8adca9e5e8fd19be07b2ea9c524d9e8617d4cb74bfd7dcb0d5a68f

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and Flash content, as well as heuristic firings related to JavaScript actions and hex decoding with exploit indicators. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file, 'javascript_obj0006_000.js', is a key artifact, likely containing obfuscated code designed to execute a secondary payload or exploit a vulnerability. The presence of RichMedia (Flash) further suggests an attempt to leverage multimedia for malicious purposes.

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` `910a2155e1a12a576688ae81eacef8da97590631b3745a70274b43c34708d79c`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1534 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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