PDF malware analysis — malicious · a3a5806c0291a6bf

MALICIOUS

PDF

11.0 KB Authoring application: .a

MD5: 8e01cc67e4247deed4be65535b1d3151 SHA-1: f5672078afc6709e0ea6f3b6a816cebfd033fa7e SHA-256: a3a5806c0291a6bf97aa5e9afc0cf466c547ec393e234fccc789d7b0707b6962

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings related to JavaScript and unescape functions. The embedded JavaScript file, 'javascript_obj0018_000.js', is likely responsible for executing malicious code. The exact intent of the script is unclear due to obfuscation, but it is highly probable that it downloads and executes a second-stage payload. The document body text is unreadable and does not provide further context.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js` `c3aad13dbdc275343252dfe85f0f60fd92cb9c3cbc4ec229e8299a584b186c68`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	163486 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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