Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fc9622e449f32f…

MALICIOUS

PDF

1.95 MB Created: 2011-01-18 11:23:26 Authoring application: Microsoft® Office Word 2007
MD5: 022f6092433a9da4f5b3712ea7550baa SHA-1: 2318219711259a6fd6e408e77bd67469dc1b5bc4 SHA-256: 02fc9622e449f32f0b5055ac52c4867b6955dbe99fca7f89b18795b7d08f0aee
772 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1190 Exploit Public-Facing Application

This PDF document contains multiple critical heuristic firings indicating it is an exploit kit designed to leverage several Adobe Reader vulnerabilities. The embedded JavaScript, obfuscated using a character table, reconstructs and executes shellcode that downloads a payload from the URL http://ixa3.1dumb.com/w.php?f=17&e=5. This indicates a multi-stage attack aimed at client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 18

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • 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. (identified after JavaScript deobfuscation)
  • 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. (identified after JavaScript deobfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • 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.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Pdf.Exploit.Agent-36395 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36395
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Character-table JavaScript eval stager high PDF_JS_CHAR_TABLE_EVAL_STAGER
    PDF JavaScript reconstructs an exploit stage by indexing into a small character table, appending hundreds of one-character fragments, joining the array, and evaluating the result. This static fallback fires only after the bounded decoder recovers an exploit-like stage, so it catches this obfuscation even when no single CVE API signature is available.
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ixa3.1dumb.com/w.php?f=17&e=5
    • http://www.microsoft.com/typography/ctfontshttp://fontfabrik.comYou
    • http://www.microsoft.com/typography/fonts/default.aspx
    • http://crl.microsoft.com/pki/crl/products/CSPCA.crl0H
    • http://www.microsoft.com/pki/certs/CSPCA.crt0
    • http://crl.microsoft.com/pki/crl/products/tspca.crl0H
    • http://www.microsoft.com/pki/certs/tspca.crt0
    • http://www.microsoft.com/typography

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00007e45.bin
d42a79cea69d29536dc630f78080603e3ec6b90eed9dbb23cb2c318371084fd8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7E45 181032 bytes
stream_008_off0001c9b0.bin
1425854f8528df897b25cf332f7198c14bd3f7062b459ef459d28bb4ae8bbf48		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C9B0 197552 bytes
char_table_stage_000.js
2eeceaf99740b38a7114117e35cd19b56ad2edae435a3484f9d6a86e8c242b11		 deobfuscated-js char-table indexed JavaScript (raw) at offset 0x5D3EC 3858 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
polyglot_child_pdf_off00001ff6.pdf
3f73cab0737f87b75bcb200299dfe0ff72a4999dd8f970bbdf7ca3c4c0ec31e8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1FF6 2039818 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36395
Obfuscation or payload: unlikely
javascript_obj0076_000.js
c76fac3c901d57f8d1455e940403ab35320466170dd1ce8faddc29852d1729a4		 pdf-javascript-stream PDF /JS object 76 at offset 0x2C2 46132 bytes
polyglot_child_pdf_off0005d0a8.pdf
6f43a85550f183b26365363c95d2b46aacb418613b4223ed00b998b5264c8963		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x5D0A8 1666904 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36395
Obfuscation or payload: unlikely

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