Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c34d06a36be9e9d…

MALICIOUS

PDF

738.1 KB
MD5: 07984e2c807b4be8ed5599b296491dc3 SHA-1: 990ed0120caba57c8f5d0a5c18d1bceff36ad770 SHA-256: 0c34d06a36be9e9dc905c551055a5e3540be411cdb24660889bb067b94a1fe39
266 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and exploits the CVE-2010-2883 vulnerability, indicating it's designed to execute malicious code. The JavaScript is heavily obfuscated but appears to be constructing a URL or command to download and run a secondary payload. The presence of an embedded PDF and exploit cluster signals further confirm the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 10

  • 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.
  • 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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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
  • 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.bitstream.com
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xfa/promoted-desc/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/
    • http://www.xfa.org/schema/xfa-locale-set/2.7/
    • http://www.xfa.org/schema/xfa-locale-set/2.6/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053fb.bin
e31f8c8507e52f29008d946a00becde9f839e34cb108985ce66167bf881adafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53FB 8084 bytes
font_10_sfnt_off00012d2d.bin
422bc5698ba5d9d4818f6a2d8b3abca2f723e713b44a15c390139d2c976a1388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 65932 bytes
font_11_sfnt_off0001cb8f.bin
7e24ee16c8b09ee74d61445f29c3c0a95abfdf17fc1008606394f159dbd0c106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB8F 65932 bytes
font_12_sfnt_off000269ed.bin
57e24925bc6bdb98d38e8b4ba3b87f80f75c5e49ea9a522486790d7dc6848549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x269ED 65932 bytes
font_13_sfnt_off00030814.bin
1f068d668b316fcb46f0801be00137fb749cc7fda5ca15e442829d6c303d8f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30814 65932 bytes
javascript_obj0026_000.js
1d1885b6c800938e7ec00d369726a3bf52b65eebedcdd60cc006c36da6cab07f		 pdf-javascript-stream PDF /JS object 26 at offset 0x47BF 9609 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
polyglot_child_pdf_off0003adc2.pdf
63f4cfa973525be2ab35fb007f9f04339c7c4e04754a602478a35f51580f1820		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3ADC2 514725 bytes

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