PDF malware analysis — malicious · 03ab80626cd28930

MALICIOUS

PDF

17.8 KB Created: 2010-03-09 19:18:36 Authoring application: FhvB0BCcvF (via iRzm8mS)

MD5: 0ac1b098d682fea62c2bb86751925050 SHA-1: 7768b9d7091de5d09c3ac439619c18939a3b619c SHA-256: 03ab80626cd28930982891e6f74f1a9378f6478f8782b54bad0251d39184c255

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation and potential exploit code. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the exploit cluster heuristic.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
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_obj0007_000.js` `73af4c63050ea6445e30a8c896535099cdeebfe3636f071fe8a98db2e6843ac0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	17011 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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