PDF malware analysis — malicious · 7509a656c28fe2a4

MALICIOUS

PDF

17.9 KB Created: 2010-03-07 17:18:28 Authoring application: rzYwzakYQF8bu (via GpQ99hIk2uw)

MD5: 6d762759e731296b396d0fb08eae8005 SHA-1: de3a4f5259f231c378057e76bf52655c41f868f5 SHA-256: 7509a656c28fe2a434a92269c78e2efb0be3d03a9465955222ed4547d21ffad6

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 `fromCharCode` functions, indicating obfuscation and likely malicious intent. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is the primary indicator of malicious activity, suggesting it's designed 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` `b9070ed011ba81abce0eda983f5563d5ef15d74d5d74b62b9c4d7c7cd22f764b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x245	17048 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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