PDF malware analysis — malicious · 2db4530953bc2d67

MALICIOUS

PDF

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

MD5: ca0d8c216040075ee85dc93c55db0621 SHA-1: 2206ce36f0504da3b0feba438286ee7c9d4299b0 SHA-256: 2db4530953bc2d67facd17d27c433b6dcee2f5ea8361634d01c66f90b182bb6b

96 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_FROMCHARCODE. The ML classifier strongly flags this PDF as malicious. The JavaScript stream, identified as javascript_obj0001_000.js, likely contains obfuscated code that uses an eval() call to execute, a common technique for downloading and running further malicious content. The presence of String.fromCharCode further suggests code obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `30dba04872c0c159a07ee50a4dc34c880eae2d6b9227e467cc90c11e3fa595fe`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	532 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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