PDF malware analysis — malicious · 13ac826f444ddb1d

MALICIOUS

PDF

89.0 KB Created: 2008-03-03 17:06:20 +08:00 Authoring application: Advanced PDF Repair: http://www.pdf-repair.com

MD5: 4755534869a3335199199847fb969be5 SHA-1: e9fb9416eb6a840b6c330668b670e67362813031 SHA-256: 13ac826f444ddb1d99d98ec8ee7b65d86ddccc3f1910f3960d0c73de4aea1f73

226 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript, including eval() calls, which is a strong indicator of malicious intent. The presence of PDF JavaScript exploit cluster heuristics and ClamAV detection further supports this. The embedded JavaScript streams are likely responsible for downloading and executing a secondary payload, a common technique for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9518

Heuristics 9

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.pdf-repair.com
- http://www.pdf-repair.com)/Producer(Advanced
- http://www.pdf-repair.com)/ModDate(D:20100406171120+08
- http://www.pdf-repair.com)/ModDate(D:20100406171120+08'00')/Title(Microsoft
- http://www.w3.org/1999/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0038_000.js` `a4a1c087e3c13236d8a7b70107ac86c63114c0af9e9a3f37b0a58febffbd0688`	pdf-javascript-stream	PDF /JS object 38 at offset 0x151F	2656 bytes
`javascript_obj0038_001.js` `82951adef2a5eef0d9585b03b5d40c71294c809385c8502a9e0a795d33ad39e0`	pdf-javascript-stream	PDF /JS object 38 at offset 0x1556	85685 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`stream_001_off00001556.js` `d09b3f8531bbd0b9fb1a15b94dac709f7710e3e969ad94204049ce689fed2ee0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1556	18155 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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