PDF malware analysis — malicious · 182d4ba1097a94d9

MALICIOUS

PDF

4.9 KB Created: 3564-48-33 77:35:65 -28:24 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)

MD5: 8ce82f8dc18ba5265c1542f05efdffe5 SHA-1: 0bef2af50bc3a159574148f1922d5b6b7754e48b SHA-256: 182d4ba1097a94d9e410702c73c8cc4afc44be6bbaca67efe7786d6c4d596f0b

370 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that exploits CVE-2007-5659 (Collab.collectEmailInfo) to download and execute a second-stage payload. The script explicitly constructs the URL http://v2count.net/exe/132/win32.exe for this purpose. Multiple critical heuristics and ClamAV detections confirm the malicious nature of this exploit.

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: Pdf.Exploit.Agent-36306 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36306
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)
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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.
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://v2count.net/exe/132/win32.exe
- 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0028_000.js` `f5db979bdc4d1538d79c2f64facd73b51774420e07f8cb0c9c604a0e90495c95`	pdf-javascript-stream	PDF /JS object 28 at offset 0x55A	2083 bytes
Detection ClamAV: Pdf.Exploit.Agent-36306 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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