PDF malware analysis — malicious · 12ae5fcf2f1de51b

MALICIOUS

PDF

14.8 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 05e23ad5074722d21f089c27b98a9915 SHA-1: 70366769a15b8c7eba978b8c27424f4ea895f732 SHA-256: 12ae5fcf2f1de51b87b474539041a8f6dd75837f980a4a078323bcd33e211af7

268 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file containing heavily obfuscated JavaScript. Heuristics indicate a PDF JavaScript exploit cluster, including eval() calls, and ML classification strongly suggests maliciousness. The JavaScript appears to be designed to download and execute a second-stage payload, as indicated by the exploit cluster and the presence of embedded JavaScript streams. The ClamAV detection of 'Pdf.Exploit.Agent-36118' further confirms its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
ClamAV: Pdf.Exploit.Agent-36118 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36118
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `80e9a72816ba03c8550050399b0fe0bf8e653a9bd4d5aedb98285454ca41ab94`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13581 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj0013_001.js` `310a130e77fd05d8aca8e1d68bff67b31abafbdca2e95aac02077487a1092333`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14287 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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