Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd533cd99174c5e…

MALICIOUS

PDF

235.2 KB Created: 2010-02-23 12:29:53 -08:00
MD5: 6a0aa7a320a4826f9353976cffdba84e SHA-1: b6cb3881f732c3c95f3e969abd5f2ca09426cefa SHA-256: 0cd533cd99174c5e79494435f52b21bf790ed86c8d15ef305939349eb01cf8b6
376 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is identified as malicious due to critical heuristic firings indicating an exploit targeting Adobe Reader's LibTIFF component (CVE-2010-0188) via XFA JavaScript heap-spray techniques. The embedded JavaScript, though truncated, is associated with exploit code and heap spraying, suggesting it's designed to download and execute a second-stage payload. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 14

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
  • Flate image XObject contains x86 NOP sled high CVE related PDF_FLATE_IMAGE_NOP_SLED
    PDF embeds a FlateDecode image XObject whose decoded bytes are dominated by x86 NOP instructions, alongside form or embedded-file delivery structures. This is exploit payload staging evidence and is related to Adobe Reader parser-exploit families, but it is not a unique CVE fingerprint by itself.
  • 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.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • ClamAV: Pdf.Exploit.Agent-21760 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-21760
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 1 text block(s), carries a click-outward action, and is only 235 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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)
  • Embedded script payload in PDF stream low 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.
  • 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://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://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-locale-set/2.7/
    • http://www.xfa.org/schema/xfa-locale-set/2.1/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • http://cgi.adobe.com/special/acrobat/update
    • http://www.w3.org/1999/xhtml

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0002.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x19FA 85 bytes
embedded_file_obj0003.bin
0cae1494b9c99505bf126e683a1a8be36bc8d5e793ab829e266d6e2fd62ccac3		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x1AAC 1466 bytes
embedded_file_obj0004.bin
1b57e7c1e4bc1f8daf7cdf9c6223b19580c93789063a99232ed1cb040470df13		 pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x1D6B 9148 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
embedded_file_obj0005.bin
f47c3dc8c4eeb64abc2cc332be719add15af6ce6dfdcdb477c08a1aefdbe7477		 pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x290F 11740 bytes
embedded_file_obj0006.bin
226eeacc5eecef2a05ca480f144ff6936594e20b5c7672e8f29f25c8bea65a56		 pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x2AD7 2928 bytes
embedded_file_obj0007.bin
4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5		 pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x2E44 200 bytes
embedded_file_obj0008.bin
d51b9fc28b592405fb598e711d1495e1421571073bc2e8542d55389768716c06		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x2F37 835 bytes
embedded_file_obj0009.bin
e65f1e07bc965092b3153e64a1e8777a909cc47a98c0e2a10d38c47def2e6652		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x3110 291 bytes
stream_002_off000003e1.js
f574e4d51594d1a8fd22e125b109b827c437aa898edc78babb62dbb93f8744f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3E1 1532 bytes
stream_003_off000005cc.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5CC 870 bytes
stream_008_off0000112a.bin
8358d835225babc82acbcbbf2cb07512b8fb3772c5b46ff5956d2c6d02da8c39		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x112A 3024 bytes
embedded_pdf_script_00034a58.bin
964b35fd2cf89dd55c1ec763fabaa19e720fcce510e60402ad1e45eecd2754e0		 pdf-embedded-script PDF raw stream script payload at offset 0x34A58 9163 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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