PDF malware analysis — malicious · 67a5679ac9a552aa

MALICIOUS

PDF

16.9 KB Created: 2010-03-14 19:18:35 Authoring application: BcYM9ZuEui9SdQ (via UIXildCtbhebb)

MD5: eb40ad3531de6a6fb4ba87212b77ba4b SHA-1: 99c834b3b8de4a407cef736e7be1c82ce9f8baf0 SHA-256: 67a5679ac9a552aa2d4d5c8da11eca1597f4f54fcfb3358e8498755a440b4852

156 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 that utilizes eval() and String.fromCharCode, indicating obfuscation and a high likelihood of malicious intent. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript is the primary indicator of malicious activity, likely serving to download and execute a secondary payload.

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` `6cdf7850c5fd50dde083e0f9766899993755a489968c9be02b1daac747affd54`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23C	16109 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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