Malicious PDF — malware analysis report

Static analysis result for SHA-256 3227553411f9c4e0…

MALICIOUS

PDF

59.8 KB
MD5: 504fce7a60692d91312c4db41a59944c SHA-1: 84bb33bb407051c91ab9701bc79466c2d24a09eb SHA-256: 3227553411f9c4e042576e935eec0f794e521a74db9016168f74d416a3c42863
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The script utilizes eval() and unescape() functions, suggesting obfuscation and dynamic code execution. The presence of a RichMedia (Flash) object and an embedded file further points to a multi-stage attack. The deobfuscated JavaScript file 'legacy_pdfkit_stage_000.js' is identified as a key artifact. The overall pattern suggests the PDF is a dropper for a second-stage payload.

Heuristics 9

  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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/AcrobatAdhocWorkflow/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0003.bin
f0156a5c9cfac0444d237fb92b5b9731faaa34f807b3d583c1b88283feefed46		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0xE20 26804 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
legacy_pdfkit_stage_000.js
a6a68cec92c9ff48318a37483a59e2a964f15a3a86cc6c540ba4da0f3673d267		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x62E 383 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0019_00.bin
f803b53e886228537ec2963c6297f28f3bf865032f352636e9c2698b0a5c6e6a		 pdf-objstm-decoded PDF /ObjStm 19 0 obj (inflated) 6708 bytes

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