PDF malware analysis — malicious · 772e4b040b38b54c

MALICIOUS

PDF

475.2 KB Created: 2008-03-20 15:51:33 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.1.0)

MD5: 1e6ba2939197a2a36a4ce5fc6c9039f0 SHA-1: 8a521d443277a589ad4451616a6234757d4a6625 SHA-256: 772e4b040b38b54cb637947f34ef20ea5ec952979a80bbaa8084634c05190cb3

338 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that exploits the Collab.collectEmailInfo method, a known vulnerability (CVE-2007-5659). The script is heavily obfuscated but appears to be designed to download and execute a second-stage payload, as indicated by the 'unescape' function and the overall structure of the exploit cluster. The extracted JavaScript file, 'javascript_obj0032_000.js', is the primary artifact of this malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 10

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (matched in decompressed stream)
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: Win.Trojan.Dropper-82 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Dropper-82
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`txt` `cc0fcf4b1804fed165c8961890183c4f89a85d9888ad5009409a060cb862af46`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x1134	2041 bytes
`javascript_obj0032_000.js` `58b654326c3fbb53baf38fc48e979ee8d32a824d8b6b6cf91f0658dfdb45ebf0`	pdf-javascript-stream	PDF /JS object 32 at offset 0x7DD	4622 bytes
Detection ClamAV: Win.Trojan.Dropper-82 Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).

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