PDF malware analysis — malicious · e895aab7e3de8caf

MALICIOUS

PDF

1.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 72b6c200c35e08a4dd73f79c761e16d0 SHA-1: 7dd2365470a1ef73a16572aba2ca846899cc4e32 SHA-256: e895aab7e3de8caf2a8523876dd5d88acca5e35a87808bb6c7e47bc5df144063

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, named 'javascript_obj0001_000.js', is obfuscated and uses eval(), suggesting it's designed to execute malicious code. The presence of String.fromCharCode further points to obfuscation techniques commonly used to hide malicious payloads. The primary intent appears to be the execution of a second-stage payload, likely downloaded from a remote source, which is a common attack pattern for weaponized PDFs.

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.
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_obj0001_000.js` `5c825070a158f8bad817481dbc00d910988efbc2da1065333b7348c8fb92b6b3`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	1025 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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