Malicious PDF — malware analysis report

Static analysis result for SHA-256 83136809bdf78ae1…

MALICIOUS

PDF

19.7 KB Created: 2010-02-28 13:24:14 +03:00 Authoring application: Acrobat Editor 9.0 (via Adobe Acrobat 9.3.1)
MD5: 2ab2466c30d056749cbeea6c5fd21d51 SHA-1: a257a5cc2c6f02061c42fedac40eb34cb86c5048 SHA-256: 83136809bdf78ae1b73fbc4efca219e0fe16862333acdf8f8f13a91ebae1b404
108 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript that utilizes the `unescape()` function, a common technique for obfuscating malicious code. The critical heuristic firing for CVE-2007-5659 (Collab.collectEmailInfo) indicates a known vulnerability exploitation. The JavaScript appears to be constructing a payload, likely intended to download and execute a secondary malicious file. The presence of JavaScript and the exploitation of a known PDF vulnerability strongly suggest a malicious intent, though the specific family cannot be determined from the available evidence.

Heuristics 4

  • 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 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/
    • http://ns.adobe.com/AcrobatAdhocWorkflow/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0000404c.bin
3016afd6e9bbadb3bd2a0190edf15b48f863d299d3db20a76a9b03740b4f91ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x404C 5282 bytes
objstm_0023_00.bin
ff10c5e8f4231db26a730699372301db521c80c35486619d4aac175dfc8d17bb		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 279 bytes

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