PDF malware analysis — malicious · b1336f9f6b20131d

MALICIOUS

PDF

37.7 KB

MD5: 14070ec9253ab06e11e8309f0f2d8e75 SHA-1: 899f0ec3ce7ac93c3c1de7580d84fea68f122415 SHA-256: b1336f9f6b20131df53cd5da8c68cf0d8e486688802b650af41c833b7a42e0a8

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a Flash object, both of which are common vectors for exploiting vulnerabilities. The ML classifier strongly indicates maliciousness. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is highly suspicious and likely responsible for initiating the malicious activity, such as downloading and executing a second-stage payload. The presence of PDF-specific exploit indicators further supports this conclusion.

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 0xACB	55839 bytes
`javascript_obj0006_000.js` `8ab00533b0fa52648f07d7e2a297cac33c8f33dc1f44d59847f69e4665a565f4`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1582 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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