Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae2ac75bce37a4a…

MALICIOUS

PDF

247.8 KB Created: 2010-10-30 15:21:34 +08:00
MD5: 29a91b4121d383eab9c3b1e6719c7f10 SHA-1: 90e4cf8cde48173e9ac2e0c3339113842cee6626 SHA-256: cae2ac75bce37a4a0d2e108202c9b1a526175948ccd3db81ee8e1f6d63eedba4
380 Risk Score

Malware Insights

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

This PDF file exploits CVE-2009-4324 using embedded JavaScript, as indicated by multiple high and critical heuristic firings including 'CVE_2009_4324: media.newPlayer' and 'PDF_GENERIC_STAGE_RECOVERY'. The embedded JavaScript, specifically 'generic_stage_recovery_000.js', is designed to download and execute a secondary payload. ClamAV detection of 'Js.Exploit.Shellcode-18' further confirms the malicious nature of the embedded script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 12

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Js.Exploit.Shellcode-18 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.Shellcode-18
  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • 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.
  • 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
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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/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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
1.swf
747b7f4f4534d1274364f133076e3209cee76abedfd72c62b46cd7ff51f8b182		 pdf-embedded-file PDF EmbeddedFile object 31 at offset 0x17EF 367 bytes
2.swf
b55100fe187899aa5adb8ec02aedaabcb4f360d3141ff373afe54e82df188398		 pdf-embedded-file PDF EmbeddedFile object 35 at offset 0x1AC8 22946 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
javascript_obj0041_000.js
60512d9bbe34ccc6af641d913d29476d7e675805b7436ee447cd65a82cb54f1f		 pdf-javascript-stream PDF /JS object 41 at offset 0x79C0 51748 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely
generic_stage_recovery_000.js
0e081db61163bc37d326f927b9cbc8269fe3487772cbdc63fcbc40dc4cc92f41		 deobfuscated-js generic stage recovery null-collapse from JavaScript object 41 at offset 0x79C0 25890 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 20 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
generic_stage_recovery_001.js
9d2f68678bc893be129fdc399780bf44f17031f0ced74bcc948c5d4823d13088		 deobfuscated-js generic stage recovery null-collapse -> marker-XX-to-%u from JavaScript object 41 at offset 0x79C0 15719 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 20 eval/decoder/string-building token(s).
objstm_0047_00.bin
2d0df7ac4ec17ac82fd40d3516a4bc36fc2f0fb9e388ff6316050e2da2ab29f4		 pdf-objstm-decoded PDF /ObjStm 47 0 obj (inflated) 455 bytes
polyglot_child_pdf_off00033d2d.pdf
f8e7e35311735fe29c3c96cdb0e303692f34fa9a3a436c67a39f40e4df33099e		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x33D2D 41475 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely

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