Malicious PDF — malware analysis report

Static analysis result for SHA-256 c330051df8f4e7ee…

MALICIOUS

PDF

6.5 KB
MD5: c67dfa2ec3f19bc2cc56c8f4ce8d88f1 SHA-1: 009bbd74619f123f32fabda07cbcf7a4953037bf SHA-256: c330051df8f4e7ee3ac0eca9b1c7b747a4f18859660d0e2ad2d7b7bacb265588
118 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is obfuscated using unescape(). The critical heuristic firing for CVE-2007-5659 (Collab.collectEmailInfo) indicates the exploitation of a known vulnerability in older versions of Adobe Reader. The JavaScript is likely designed to download and execute a second-stage payload, although the specific actions are obscured. No external URLs were found to be malicious.

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
351b42de199db5335ded3b9ad599ba242dbefaeda82b3468e9f61386a7374db7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325 1409 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
objstm_0024_00.bin
c085e9d36be86929b94bfe1ddc40f52466aa204cf9b66368e6d0e5f8b041d53d		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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