Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c4f3b0d1af4a10…

MALICIOUS

PDF

218.9 KB
MD5: 01f215e0e6aba3fcc7865a611cc3ed5f SHA-1: f76fc0002aa4df677106cc28a371a516319d20c3 SHA-256: 94c4f3b0d1af4a10ea2ba97ae880c6147403a3d692cde9b9691b8c92144bd7e9
114 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. The presence of PDF_CVE_2023_26369_RELATED heuristics suggests exploitation of a known vulnerability. The extracted JavaScript stream, stream_003_off000004bb.js, is the primary artifact likely responsible for further malicious actions, such as downloading and executing a second-stage payload.

Heuristics 8

  • TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED
    PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000004bb.js
a722a23e6d1c0cb9e7d0663718136c497de2c77ea6355bc1e6376f9d79cfe164		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BB 2555 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0102_00.bin
ff2e8f9a85037b5ddb26bc1969ff0d8e0441cad12aa4bb8825efe1988d935aa3		 pdf-objstm-decoded PDF /ObjStm 102 0 obj (inflated) 4186 bytes
font_00_cff_off0002be58.bin
939e1098044fb874ecb1afa75c512b2811e3211e2a8dd4235077fbca2a1c9046		 pdf-font-stream PDF embedded font (cff) at offset 0x2BE58 5637 bytes
font_01_cff_off0002d30b.bin
97331aad8016a8c3f9c645c5a3dad8df8222cc4df3d68bfab0b42c8a9fba1b7d		 pdf-font-stream PDF embedded font (cff) at offset 0x2D30B 7396 bytes
font_02_cff_off0002ee0a.bin
bfae74e5e4e313dbeb619a64c7437640ece16ca17e4cf0385f56ea53141105eb		 pdf-font-stream PDF embedded font (cff) at offset 0x2EE0A 6239 bytes
font_03_cff_off0003048b.bin
085e421e232f7f28002bc691218df4fbd383b48d44cf4aa9b43c50ba72dbf809		 pdf-font-stream PDF embedded font (cff) at offset 0x3048B 7803 bytes

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