Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd16d0205ee39bdc…

MALICIOUS

PDF

194.4 KB Created: 2008-03-27 16:31:58 +08:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0 (Windows))
MD5: d9166aebc45d9fbd3c58ea3114fda642 SHA-1: 56842dd46224ee432639295045a8015df0503046 SHA-256: cd16d0205ee39bdc98283388b1fbbaf8ff50a464921b34d183d6107d51810bfa
314 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes the 'unescape()' function and exploits the 'Collab.collectEmailInfo' method, known to be vulnerable to CVE-2007-5659. This exploit is designed to download and execute a secondary payload. The presence of an embedded PDF artifact with suspicious static findings further supports this conclusion. The primary attack vector is likely a malicious link or attachment leading to this exploit.

Heuristics 11

  • 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)
  • 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.Exploit.Agent-35909 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35909
  • 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)
  • 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
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • 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/pdfx/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0041_000.js
9bdbfa5df6f827ff63cd61e1f8d58420b7f4b59844725102d812651a2abe8b1e		 pdf-javascript-stream PDF /JS object 41 at offset 0x504C 3404 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 17 eval/decoder/string-building token(s).
stream_004_off00000b4e.bin
c9befcefdb105dad314ee2b2383edde5a278aafa828c32b7a1013150cf3dd8ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB4E 20634 bytes
polyglot_child_pdf_off0002a0c8.pdf
e66635b3fa94a0ccfe3293b90d972313f0fadd409d41db640aa12d67ac54acc8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2A0C8 26872 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35909
Obfuscation or payload: unlikely

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