Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfda176f3f3c8145…

MALICIOUS

PDF

205.4 KB
MD5: 5f4b6377bf3277e7c78dd39c87bd90f9 SHA-1: ed8a49748dd6b2f0bc1ab400b360e7c550184353 SHA-256: cfda176f3f3c814584fe300ba8874050522ce5b6a6114a800c99585a9d68391d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes the 'unescape()' function and targets the 'Collab.collectEmailInfo' method, indicating exploitation of CVE-2007-5659. This vulnerability is known to allow for arbitrary JavaScript execution within Adobe Reader. The presence of a secondary embedded PDF with similar suspicious findings further supports this attack vector. The primary intent appears to be the execution of malicious code via a known PDF vulnerability.

Heuristics 7

  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Suspicious extracted artifact high 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000006c5.js
b4c98bbde545c8f480590e02dcd0cd25cd2aaaf3eb420acf39c36e3a8ff70666		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6C5 3308 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 17 eval/decoder/string-building token(s).
objstm_0023_00.bin
9b88c36a65f6579b55ad0b942c1ac40847a1551928d4a84a4fa1474060848f4b		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 471 bytes
polyglot_child_pdf_off000313d1.pdf
3cc4fc7dbd73c1b50832e912de0d6459ce42e9a6dad452625905fd9cc5e6a6cb		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x313D1 8677 bytes

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