PDF malware analysis — malicious · 5253790ecef98642

MALICIOUS

PDF

14.7 KB Created: 2009-09-20 19:41:94 Authoring application: PDF Library 9.6.5 (via PDF Library 5.8.2)

MD5: 3f87e68e55c2cd734117a79cb189da9f SHA-1: d3c175f3dfd3360a4e84656a1031e19f2586db4d SHA-256: 5253790ecef986421f137dbb59da4223e505b4d961d12b352fed2030eee0d7e9

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/VBScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes eval() and String.fromCharCode(), suggesting obfuscation and dynamic code execution. The PDF_FILTER_HEX heuristic also points to potential exploit indicators. The primary artifact is the embedded JavaScript file 'javascript_obj0007_000.js'. The obfuscated nature of the script prevents a definitive determination of its exact payload, but the techniques used strongly suggest it's designed to download and execute a second-stage payload.

Heuristics 7

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)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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` `b6e4a9772e80afb65b3f7ac6973439e4e4f346659c3a40bc5936224391f50698`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	121874 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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