Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5cd7cb93d63d1c…

MALICIOUS

PDF

375.3 KB Created: 2010-11-11 11:35:07 +08:00
MD5: f928c39f0bfebaaf3a5fb149557ddf66 SHA-1: 87c17dc9282792906ef41670011c2473c87c9b9b SHA-256: 8e5cd7cb93d63d1c67f61b37f142f8726328161483d571acde97b1de8abe65cc
380 Risk Score

Malware Insights

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

This PDF file exploits CVE-2009-4324 using embedded JavaScript. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ClamAV detection of 'Pdf.Dropper.Agent-6041969-0' and 'Js.Exploit.Shellcode-18' further supports this assessment. The presence of embedded SWF files and multiple JavaScript streams indicates a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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: Pdf.Dropper.Agent-6041969-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-6041969-0
  • 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/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
jit-spray.swf
747b7f4f4534d1274364f133076e3209cee76abedfd72c62b46cd7ff51f8b182		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x1C9F 367 bytes
2.swf
b55100fe187899aa5adb8ec02aedaabcb4f360d3141ff373afe54e82df188398		 pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x1F88 22946 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
javascript_obj0052_000.js
307fdec7aac2ea7b48e6b9675aae2deed746f5c7d0ca2ac3cb56aa265bb85ec0		 pdf-javascript-stream PDF /JS object 52 at offset 0x7E86 53986 bytes
generic_stage_recovery_000.js
d36b86d2a0fb02f96ea0b3e3fb134ddc3143d1706a19aa8b324d22936629bec7		 deobfuscated-js generic stage recovery null-collapse from JavaScript object 52 at offset 0x7E86 27009 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 20 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
generic_stage_recovery_001.js
5e812d56dca895110b344e5f1a4c1a659a068937715ca885078091a43331cb32		 deobfuscated-js generic stage recovery null-collapse -> marker-XY-to-%u from JavaScript object 52 at offset 0x7E86 26663 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 20 eval/decoder/string-building token(s).
generic_stage_recovery_002.js
c1bdc7cdf23b0a0820d641673e242f396018c6e702378474c36f8e3e73723df6		 deobfuscated-js generic stage recovery null-collapse -> marker-XY-to-%u from JavaScript object 52 at offset 0x7E86 21679 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 20 eval/decoder/string-building token(s).
objstm_0059_00.bin
29b23a93afdfdac79a4ed4739cc45ccaf113ada996b6e6a5305ed991f5a93de7		 pdf-objstm-decoded PDF /ObjStm 59 0 obj (inflated) 453 bytes
polyglot_child_pdf_off000535e0.pdf
dd5eeaaaf61ed6f7db46fd8d9198e35fd3a0e197ce34a44a7d2ce22890c9dac5		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x535E0 42799 bytes

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