PDF malware analysis — malicious · 924ff85f443af7a8

MALICIOUS

PDF

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

MD5: 623a9cddebc985b4b9cd81309d210eea SHA-1: 221dec8d1e990192160c3b825ae7c95dc384bc54 SHA-256: 924ff85f443af7a8691dd0bd1fc9ef1d6223f472a047a769650be4a375fe8b14

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes String.fromCharCode and an eval() call, suggesting obfuscation and dynamic code execution. This pattern is commonly used to download and execute further malicious payloads. No specific family could be identified due to the obfuscation.

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` `c7bd935bb1818d55a30c98125ef8d86974926bfb3daf7dbec21cde77298c0296`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	972 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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