Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c439d405733257a…

MALICIOUS

PDF

192.1 KB Created: 2010-07-26 16:38:32 Authoring application: Microsoft® Office Word 2007
MD5: 1b81ec66ab49c8895862f6a50fc0d801 SHA-1: 134057062c19ad4a63786fb032c53609f06ae1fd SHA-256: 4c439d405733257aa9a041f1fe6cb16d5800bfb8f9b170ff469143d3c52b22e6
198 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and triggers an OpenAction, indicating an attempt to automatically execute code upon opening. Specifically, the CVE_2008_2992 heuristic firing suggests exploitation of a known vulnerability. The presence of JavaScript and the unescape() call further support the execution of malicious code, likely for downloading a second-stage payload. The embedded URLs, while mostly benign, include one unknown reputation URL that could be a command and control server or download source.

Heuristics 8

  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
  • TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED
    PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
  • OpenAction trigger high PDF_OPENACTION
    PDF has an /OpenAction — code runs automatically when opened
  • 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.
  • 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.color.org
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.aiim.org/pdfa/ns/id/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0057_000.js
ea139b942ead4119a0729e527c1582a1df531046252c375453a2a95d30c2b04a		 pdf-javascript-stream PDF /JS object 57 at offset 0x2F15B 5823 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
stream_002_off00001f51.bin
1b3d79e17f65a53e314ece9e01b54b298fb91c87ba1abec996f3aa8ae086593b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F51 190988 bytes

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