PDF malware analysis — malicious · 5e2cba7e406c4d2a

MALICIOUS

PDF

9.4 KB Created: 2006-34-88 14:36:00 Authoring application: According Able (via About About)

MD5: 548f34fdcd3848f2c531c54e6b7691c9 SHA-1: 78c11bc9958bd046c10ce497737b22b02dc40fe2 SHA-256: 5e2cba7e406c4d2acbf53dd5192be6e164c8e43483dfd23872ae46d7c445939c

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_JS_EXPLOIT_CLUSTER'. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript, named 'javascript_obj0013_002.js', is likely responsible for executing the malicious payload, potentially downloading additional malware. The obfuscated nature of the script and the lack of specific IOCs beyond the script filename prevent a higher confidence score or family attribution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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_obj0013_002.js` `dde529ff636d124bd8f3e7b666f699bc22f7d5e8ea3d3bae91c2c8b8a10b1242`	pdf-javascript-stream	PDF /JS object 13 at offset 0x393	55635 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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