PDF malware analysis — malicious · 32baebac34b39608

MALICIOUS

PDF

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

MD5: 518625b43c7a4b0e3ef7a770640d96e7 SHA-1: 4b4ddc5c0fd59fed3dc62658ba33122dec359a8a SHA-256: 32baebac34b396089ffe035cea112289296df9890989d7ea239cf21ef9a795b6

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains JavaScript embedded within its metadata, which is then decoded and executed using eval(). This JavaScript is likely a stager designed to download and execute a second-stage payload. The use of String.fromCharCode and eval() indicates obfuscation techniques commonly employed by malware droppers. No specific family could be identified, but the delivery mechanism is consistent with malicious documents.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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` `547efb7a7e677da0f71517d42b95f5e4ad2e2dfbcee62370720c6f9f448d10c7`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	606 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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