PDF malware analysis — malicious · 5d025652763ae1d3

MALICIOUS

PDF

45.3 KB Created: 2010-04-07 08:32:13 +08:00 Authoring application: Acrobat Web Capture 7.0

MD5: ca121bb2340b8eb5ed230ad024ac778b SHA-1: 91c8aebb9aeabceaa5798eda13d8b5657079a5e8 SHA-256: 5d025652763ae1d34ce931b9bf7a50dd832207e2d4ca91632ae1d4ffd54eaf3e

212 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() calls, a common technique for exploiting vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent. The JavaScript is likely designed to download and execute a second-stage payload, aligning with the 'Exploitation for Client Execution' and 'JavaScript' MITRE ATT&CK techniques. Given the nature of PDF exploits, 'Spearphishing Attachment' is a probable initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9880

Heuristics 8

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-21263 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-21263
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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0050_001.js` `70c940ca448d03dc56836c5dd011e2433261e89c9ce18ff31ddad7a53b4ae68c`	pdf-javascript-stream	PDF /JS object 50 at offset 0x43AA	18151 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0054_002.js` `03d7063be2df67febd559e1a5b0bede2871051229ebde947cfa91c88700f5ce4`	pdf-javascript-stream	PDF /JS object 54 at offset 0x7081	17924 bytes
`javascript_obj0057_003.js` `43b6da6eefb069573c17b21d5feea685c4dec0505bf69ff4362f01cf7d6d031d`	pdf-javascript-stream	PDF /JS object 57 at offset 0x9BC0	18159 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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