Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e58806c281bb56f…

MALICIOUS

PDF

40.6 KB Created: 2010-08-13 18:55:56 -07:00 Authoring application: Adobe Designer 7.0
MD5: c6f05241c6117c414ec17e127549d62a SHA-1: 24270b57caa84424b2e4ebac0bd10a57dbbf3935 SHA-256: 0e58806c281bb56f349d790f025ad1d5d9a5927dc680319ae6986fae08b02bf1
414 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document leverages XFA forms and embedded JavaScript to exploit CVE-2010-0188, a known vulnerability in Adobe Reader. The JavaScript code attempts to download a second-stage payload from the URL http://cgi.adobe.com/special/acrobat/update. The presence of a heap spray and NOP sled further indicates an exploit designed for code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 15

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains XFA image data with an inline crafted TIFF payload and shellcode/delivery markers. This is the data-bound variant of the CVE-2010-0188 Adobe Reader LibTIFF/XFA exploit shape.
  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • 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.
  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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
  • 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
  • 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://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://cgi.adobe.com/special/acrobat/update
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.1/
    • http://www.xfa.org/schema/xfa-template/2.2/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.xfa.org/schema/xfa-locale-set/2.1/
    • http://ns.adobe.com/xtd/
    • http://ns.adobe.com/xfdf/

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0039.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 39 at offset 0x77CE 85 bytes
embedded_file_obj0040.bin
e5961298f15a75ec369e75b9b1d7e5eeddd772761c12e8d8647365479bce768a		 pdf-embedded-file PDF EmbeddedFile object 40 at offset 0x7880 1714 bytes
embedded_file_obj0041.bin
7be8c8795d438cddf0f6cc33dce3b405ad774eaa84635ba5df37e64bf1757056		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0x7B8A 18241 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 13 eval/decoder/string-building token(s).
embedded_file_obj0042.bin
e69191c9cbae73c8ffa3d467a14d84bfc9670521cdaeeb85a1137df5d80e94cb		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x874F 11889 bytes
embedded_file_obj0043.bin
b0ea66f7430b200638dd1d127c4ad1b7c06b84f8437385ed24bdd17795b21701		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x890F 2312 bytes
embedded_file_obj0044.bin
cd22c6b8974c7893d3c69ebeac62c694ce0c8081ddd0c9e9000b279062d0125b		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x8BF4 212 bytes
embedded_file_obj0045.bin
7438c1913b64fcc96d2a68c8cb5fc5f0dc894997332369701180bc86984c4354		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x8CEF 724 bytes
embedded_file_obj0046.bin
a60265344cf1a9e94da34c8f587f64a4297e2fa417c895852209903ab7588bcc		 pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x8ECF 85 bytes
javascript_obj0031_000.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 31 at offset 0x7006 870 bytes
javascript_obj0033_001.js
4e139c8b22ec16bd5aa51575c80dec2bbf89b76977a06b68473031a0eb206366		 pdf-javascript-stream PDF /JS object 33 at offset 0x718A 2794 bytes
javascript_obj0035_002.js
c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a		 pdf-javascript-stream PDF /JS object 35 at offset 0x7479 1528 bytes
font_00_cff_off00001069.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x1069 31178 bytes

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