Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79d54b9e36da5e0…

MALICIOUS

PDF

74.7 KB Created: 2009-12-07 13:13:16 -05:00 Authoring application: Acrobat PDFMaker 8.1 for Word (via Acrobat Distiller 8.1.0 (Windows))
MD5: f72628dd0297d1066905445623360f49 SHA-1: c8ef930694ce13208ce1f069a14bd93efbf3118a SHA-256: a79d54b9e36da5e09e9996f7746cfcf74f88d89346c3006f67c3ff16ba5e2aeb
210 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.001 PowerShell T1059.003 Windows Command and Shell T1059.007 JavaScript

The PDF file contains embedded JavaScript and triggers an OpenAction, indicating a malicious intent. The critical heuristic firing for CVE-2010-2883 confirms the exploitation of a known Adobe Reader vulnerability. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload. The presence of a mailto URI is noted but appears benign in this context.

Heuristics 12

  • Adobe Reader CoolType SING font exploit — CVE-2010-2883 critical CVE likely CVE_2010_2883
    PDF embeds a TrueType/OpenType font with an actual SING table and pairs it with JavaScript heap-spray shellcode. This matches the public Adobe Reader CoolType SING exploit shape for CVE-2010-2883.
  • 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)
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • External URI low PDF_URI
    PDF contains an external URL action
  • 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/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/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0056_000.js
2f861f7e398aab0acdca32b6fa619a22d45c48c8ffbad92eeee67152afffb2dd		 pdf-javascript-stream PDF /JS object 56 at offset 0x1D58 2936 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_012_off00007fc5.js
d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7FC5 1042 bytes
icc_00_off000073d1.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x73D1 3144 bytes
font_00_type1_off00008469.bin
c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b		 pdf-font-stream PDF embedded font (type1) at offset 0x8469 97 bytes
font_01_type1_off000086f2.bin
b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d		 pdf-font-stream PDF embedded font (type1) at offset 0x86F2 144 bytes
font_02_sfnt_off0000896c.bin
c2511c1beede9a26a17bae3962f2b2919936743f18d7be61830c124bcc84d634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x896C 65932 bytes

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