Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e435ccf1bf8744…

MALICIOUS

PDF

50.3 KB First seen: 2026-05-11
MD5: aa32f4c634d698de75f47f42e73d8cef SHA-1: 3432332e39c44b23f8c8545dcb0bf63998dab321 SHA-256: a3e435ccf1bf8744aaec07b8ee0ea957441e53d3b3848766efd3d7d49f41791f
206 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits multiple suspicious characteristics, including embedded files and JavaScript. The presence of 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'EXTRACTED_FILE_STATIC_TRIAGE' with a 'Long encoded blob' points towards the delivery of a secondary payload. The embedded file 'embedded_file_obj0004.bin' is flagged as a potential script payload. No document body text was available for analysis, but the heuristics strongly indicate a malicious file delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 8

  • 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.
  • Suspicious extracted artifact medium 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • JavaScript action low 1 related finding 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)
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic (matched inside decoded stream)
  • Embedded script payload in PDF stream info 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.
  • 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# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://cgi.adobe.com/special/acrobat/updateReferenced by PDF JavaScript
    • http://ns.adobe.com/xdp/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xci/1.0/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xci/2.8/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.4/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-data/1.0/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-locale-set/2.1/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-form/2.8/Referenced by PDF JavaScript
    • http://ns.adobe.com/xfdf/In PDF document text

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin pdf-embedded-file PDF EmbeddedFile object 1 at offset 0xCC4 86 bytes
SHA-256: f7ee3ef2f8f35d669a6c2b8b0b0ee89655bbc3d04b107a8d22531830f6fc28a1
embedded_file_obj0002.bin pdf-embedded-file PDF EmbeddedFile object 2 at offset 0xD77 2016 bytes
SHA-256: 7cfe100cbdcad5aca90e1aff8d47bd1123cf26569260667c1d765df6ce0caa2c
embedded_file_obj0003.bin pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x110B 15837 bytes
SHA-256: f3af0cf90c00df075a9ce3a70b1ab9f6630be5831085025f0de58661026ef643
embedded_file_obj0004.bin pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x1788 11695 bytes
SHA-256: 1618be88b77384b7e3d67817b9ec19bbbfc7018d18d3fd54d4daaff288c95aaa
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
embedded_file_obj0005.bin pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x1B2A 4852 bytes
SHA-256: 2680b20f4fac49f509e9b73896071e8d16550d04c32a2854f801644ece0b6d0b
embedded_file_obj0006.bin pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x1F40 1223 bytes
SHA-256: 89db6425645c1f2700e52a38498e90ca6ef07071c0662f0b1655e8eb798468ad
embedded_file_obj0007.bin pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x218E 85 bytes
SHA-256: af05f8185c725a70291567ae2112fa9a98b368528a7cc440552f0c0847d95121
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x223B 332 bytes
SHA-256: 8e2b0c5682a7ef5861af182df1c165bec1368e4ec954c0f525b7d9b0aa94381b
xfa_image_rawvalue_000.tif pdf-xfa-image-tiff XFA image/rawValue TIFF payload near offset 0x17F6 8642 bytes
SHA-256: 26b5b2a71a6a10fd5abcaa57b490813f1caeaf8cd87470ba68e6fca37db997f7
Detection
ClamAV: Win.Exploit.CVE_2010_0188-7
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: NOP sled
stream_002_off00000339.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x339 1532 bytes
SHA-256: f574e4d51594d1a8fd22e125b109b827c437aa898edc78babb62dbb93f8744f8
stream_003_off00000524.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x524 870 bytes
SHA-256: 4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb
objstm_0038_00.bin pdf-objstm-decoded PDF /ObjStm 38 0 obj (inflated) 689 bytes
SHA-256: fc38668935b818d494502afb894c15e6b0d801951a9c4fd0b0c46f76fef1fb2a

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