PDF malware analysis — malicious · e39b0d3633975680

MALICIOUS

PDF

15.2 KB Created: 2009-09-21 19:43:21 Authoring application: PDF Library 9.5.1 (via PDF Library 9.1.9)

MD5: f45852211e72c6ab685ebd0a58b8e364 SHA-1: 6edce3eae60066aa43c4566b9844fd2bbdfd04be SHA-256: e39b0d3633975680a8c24f4bbb85b3dd72626a4b3bf8fd4d26bb54038b25cce6

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes eval() and String.fromCharCode(), suggesting obfuscated code designed to execute malicious actions. The ML classifier strongly flags this PDF as malicious. The primary IOC is the embedded JavaScript file, which is likely responsible for downloading and executing a second-stage payload.

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` `48e6614cf46b67f9f575ce5336d1387b88b6e478c7c9d72754f33e2cc14bdb0a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	148329 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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