Malicious PDF — malware analysis report

Static analysis result for SHA-256 33389a55829b3ca0…

MALICIOUS

PDF

6.4 KB
MD5: 023a0dfee4a7b0da792b26ed3208bab0 SHA-1: 1da38531cabc1cd57ceced2d78ee455d8b33ab67 SHA-256: 33389a55829b3ca0b8d83ae680bf22259777a5df3518d8b14f50e24fcb98e8a5
118 Risk Score

Malware Insights

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

The sample is a PDF file that contains embedded JavaScript. The JavaScript is obfuscated and utilizes the unescape() function, indicating an attempt to hide malicious code. The critical CVE-2007-5659 heuristic firing confirms the exploitation of a known vulnerability related to Collab.collectEmailInfo, which is commonly used to achieve arbitrary JavaScript execution. This suggests the PDF is designed to exploit this vulnerability to download and execute a second-stage payload.

Heuristics 6

  • 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)
  • 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. (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)
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000325.bin
fe9f17ff0006741cb4da25d341ed816e69b873ae4a1cf17bf6cd7b6b95066fe4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325 485 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0024_00.bin
03f7364186bc6c809142b6d0ebe866e3cda2d4eadb911c77f4e16dc77557451f		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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