PDF malware analysis — malicious · 2ba94d9d0638137a

MALICIOUS

PDF

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

MD5: 49dd420ffd4b67dc923cb16187fbd67f SHA-1: 6cfda42221dfd24158a6a38a30f3a1c695a6a298 SHA-256: 2ba94d9d0638137af0c090cac79a522b67f1f3cf429d9a7293d1c0c5d679e226

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by heuristics like PDF_JAVASCRIPT and PDF_JS. A high-confidence heuristic, PDF_METADATA_EVAL_STAGER, indicates that JavaScript within the PDF metadata is used as a stager, employing eval() to execute obfuscated code. This suggests the file is designed to download and execute a second-stage payload. No specific family could be identified, and the JavaScript itself was too obfuscated to determine its exact function beyond being a stager.

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` `6e16f6e86597441ba134b050cec2b2ebc890f6b67f06b181dae43e1555ae52e7`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	595 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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