PDF malware analysis — malicious · 5a0d5ded5cb110d1

MALICIOUS

PDF

15.3 KB Created: 2009-09-19 19:45:22 Authoring application: PDF Library 1.9.7 (via PDF Library 2.1.2)

MD5: 25000061ef366c9ce6e538fd635c1950 SHA-1: b78ea0b0e2cf49e9688ab08c13bb8d69f9568362 SHA-256: 5a0d5ded5cb110d16d832cd2fd41d0ac88ec1d5b77694faf57aa0cc1da3d99f0

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode(). This strongly suggests the script is designed to download and execute a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence. No specific family could be identified due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0007_000.js` `16b5322b0ac9d695a474bb7c95ce4706936693b4039a201ade889f2d1258975f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	162837 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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