Malicious PDF — malware analysis report

Static analysis result for SHA-256 012130a51fd14a7c…

MALICIOUS

PDF

1.17 MB Created: 2009-12-17 03:14:38 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0.5 (Windows))
MD5: 3922a380d0d03daae988e44afe28c855 SHA-1: 452055891566db537e5c21fcb7c87f5b368d5a9f SHA-256: 012130a51fd14a7c5137889ee3cfb8a8c99e11e342efc9ba34db08049d35c01e
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

This PDF document exploits CVE-2007-5659 in Adobe Reader via embedded JavaScript. The JavaScript, after deobfuscation, appears to download and execute a second-stage payload. The specific URL for the payload is not directly visible in the provided script excerpts, but the presence of obfuscated JavaScript and the exploit trigger strongly indicate a malicious downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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)
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • Suspicious extracted artifact medium 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.
  • 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
  • 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.
  • 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/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
k1
d0be25db1e121e69ca5650403645efb72f4573558e50f81ab948fd657b081c5e		 pdf-embedded-file PDF EmbeddedFile object 26 at offset 0x1EC1 2041 bytes
javascript_obj0031_000.js
e7cd69c470aa49cc3b7565d71b85c61cf70c3955add705414de9860a5705e827		 pdf-javascript-stream PDF /JS object 31 at offset 0x12B202 13125 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s). Carved artifact contains 1 long hex-escaped blob(s).
generic_stage_recovery_000.js
bdaf58b20ef070c4a6891300fdd6daf6fc2e9efa2f6eae2b5d2f8160ba6a4b6f		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 31 at offset 0x12B202 7665 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.