PDF malware analysis — malicious · 677606b5db81229b

MALICIOUS

PDF

9.3 KB Created: 2008-04-28 12:17:40 +03:00

MD5: 60fc4d218581628d6549a9cc1c40056c SHA-1: f0aac8cd97ec457a7f1407c7562d23ac199d67b4 SHA-256: 677606b5db81229b7dc70b42bd1b923a8d4d537f35ef8fb4ceb850084ce7f8c8

228 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that exploits CVE-2007-5659, specifically targeting the Collab.collectEmailInfo function. The script is designed to download a second-stage payload from the URL http://jwj2gfxes.com/cgi-bin/index.cgi?ff9f03c007f000200211024944020000000002b7db4a310000000000000000170. This indicates a clear intent to compromise the user's system by executing arbitrary code obtained from a remote server.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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. (identified after JavaScript deobfuscation)
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.
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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://jwj2gfxes.com/cgi-bin/index.cgi?ff9f03c007f000200211024944020000000002b7db4a310000000000000000170
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0016_000.js` `bcea13bcae8f92034e57ec6beaa6177690d0ac1e27bd67d18c0fdf65b7ee3886`	pdf-javascript-stream	PDF /JS object 16 at offset 0x931	6757 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `fccef2cc9a7af89ad0e7bcd669bd8a5be12f500e78a7a5520b6ea4d53c50668b`	deobfuscated-js	CRC32 callee-key hex decoded JavaScript at offset 0x931	2452 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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