PDF malware analysis — malicious · ad4b1a919cb4e473

MALICIOUS

PDF

37.7 KB

MD5: fe4be156dcccf278518fc2e809bc6819 SHA-1: 1429662c41456fab457d0cba24eaa2e571ef4729 SHA-256: ad4b1a919cb4e473b9ab49b216369e59c86e30738fc5997d9f7f6f0ba08fd53b

94 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is suspicious and likely responsible for executing malicious code. The presence of RichMedia (Flash) and the use of ASCIIHexDecode filter with exploit indicators further suggest an attempt to exploit vulnerabilities. The overall attack pattern points to a malicious PDF designed to compromise the user's system.

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
`embedded_file_obj0016.bin` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xAC5	55839 bytes
`javascript_obj0006_000.js` `9e925eddbf99d32d4cccfef2ebe39719e4e13094d253e56b0c5e392bc873939d`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1564 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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