PDF malware analysis — malicious · ecb4a47318b630fb

MALICIOUS

PDF

37.7 KB

MD5: bd3dde715940f8938fd475f66308b363 SHA-1: 040b0a04d6575f6bc45daa5a62796882ae04690b SHA-256: ecb4a47318b630fb18051d163ebacc833da5253496b0571cc30a06807b110c4b

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript and a RichMedia (Flash) object, strongly indicating a malicious intent to exploit vulnerabilities or deliver further malware. The ML classifier also flagged this PDF with high confidence. The embedded SWF and JavaScript files are the primary indicators of compromise.

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 0xAD1	55839 bytes
`javascript_obj0006_000.js` `84666209990a4aa4a1a1e9744204db184f3a15538330658af028fde0b3d1ddce`	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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