PDF malware analysis — malicious · 40a708400b6abdd2

MALICIOUS

PDF

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

MD5: 5fa065eb40ca474a679f7f493338eaa1 SHA-1: 9ca8cda8ea55c1611cfab06bd51dfd1de5f98e12 SHA-256: 40a708400b6abdd282558ee8e88c33e03adb11f7a4d9595a574e6fc0342bc351

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes String.fromCharCode and an eval() call, suggesting obfuscation and dynamic code execution. The primary heuristic firing is PDF_EVAL, pointing to the execution of arbitrary code. The embedded JavaScript file, javascript_obj0001_000.js, is the most significant IOC, likely containing the logic for downloading and executing a secondary payload. The confidence is high due to the clear indicators of malicious JavaScript execution within the PDF.

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` `cf1e77895234675b4fd01ade0e339470192e3c3ef6ecd01be51b54fa00c84e00`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	1003 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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