PDF malware analysis — malicious · bfddff22a64eec41

MALICIOUS

PDF

37.7 KB

MD5: 1a20cdc6edeb673c09155abe57898b04 SHA-1: dcb181b7ffc874bf2c3576e358a3edb865d99342 SHA-256: bfddff22a64eec41d9428e5f7bc74585fbe21ea28e5707351ef6615b62fc60ae

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and Flash content, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript file, 'javascript_obj0006_000.js', is a strong indicator of malicious intent, likely to download and execute a second-stage payload. The presence of these elements suggests an attack pattern aimed at exploiting vulnerabilities or tricking the user into executing malicious code.

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 0xACF	55839 bytes
`javascript_obj0006_000.js` `416a343d10697f555bbe64a226539628f7e47c9c40c7f1a87e740afd46835280`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1588 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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