PDF malware analysis — malicious · 83b679f1be22fb7e

MALICIOUS

PDF

4.1 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 140039a73d597a33cd021588bfc9facf SHA-1: 74bd748697a63776a32d465b17c2b166fddde77b SHA-256: 83b679f1be22fb7e57ff3d0d9b5e9eedaf3dbff03c05de8310d995499da39ce7

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_EVAL' firing specifically points to an 'eval()' call within the decoded JavaScript stream, suggesting code execution. The presence of 'String.fromCharCode' further indicates obfuscation techniques commonly used to hide malicious code. The extracted artifact 'javascript_obj0013_001.js' is also flagged for script obfuscation. The primary intent appears to be downloading and executing a second-stage payload, though the exact mechanism is obscured.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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_obj0013_001.js` `8df56e4fe46d04a3741942f8bed62fee25c1d528f3a84f8f43801bad0f02a5ec`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D2	12676 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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