PDF malware analysis — malicious · 1f6a838b456bf4bc

MALICIOUS

PDF

6.0 KB Created: 2008-12-03 13:57:41 UTC

MD5: 4044d298ff3af1196bd0745619bd42a6 SHA-1: aa728bb409f8828cbb168b2f22f94c03103eb8f4 SHA-256: 1f6a838b456bf4bcc6537b831857b28c4acc782ceb552975bff8d206405e070c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of an eval() call and String.fromCharCode suggests obfuscated JavaScript code is being executed. This script is likely designed to download and execute a secondary payload, as evidenced by the suspicious extracted artifact 'javascript_obj0006_000.js'. The document body is unreadable, but the technical indicators point to a malicious exploit delivery mechanism.

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_obj0006_000.js` `4783d4be080ae511c654887dc24c3f937d4fbaca6abb08a30911052b3be9adc9`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB4	9604 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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