PDF malware analysis — malicious · 13faa49eccc7c7e5

MALICIOUS

PDF

20.1 KB Created: 2010-03-15 22:18:34 Authoring application: yjgD7Cu (via wRBqK)

MD5: a461558064212fa3673b08cf31b33ea8 SHA-1: 3375cc3e1e56756cc2de7847b5faddb3e7429a08 SHA-256: 13faa49eccc7c7e5f8835f6430499b0b433cc3975478af930507994834ae4e98

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()`. The heuristics indicate a PDF JavaScript exploit cluster, suggesting the script is designed to exploit a vulnerability in the PDF reader. The primary purpose of the script appears to be downloading and executing a second-stage payload, as indicated by the exploit cluster and ML classification.

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` `752822f048c4d67639ce9eeed8cc6f5ea432916052d9028ebce8252f08e64ec3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x243	19402 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.