Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a999dca9ae60ab…

MALICIOUS

PDF

61.5 KB
MD5: 8c9ade1ff4820e6956b895c53a38da5b SHA-1: c737af1d67cb3dde3b7e57ff9d41664ff0ab78b8 SHA-256: a5a999dca9ae60abe6e790d1824dfac0e5c9cf8cf853abb9263042e386861a81
94 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and triggers XFA form and eval() heuristics, indicating malicious code execution. The embedded script payload, 'embedded_pdf_script_00001fa3.bin', is highly suspicious and likely responsible for downloading and executing a secondary payload. The presence of PDF_JAVASCRIPT and PDF_JS firings further supports this attack pattern.

Heuristics 8

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.
  • 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. (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)
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xci/2.8/
    • 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.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://ns.adobe.com/xfa/promoted-desc/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000034a.js
f94e41f586bf3f20bc1deeac4bfbda388a61db43f25fbd6304ba73f5653368cf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A 1313 bytes
stream_003_off00000528.js
1b2ec98752b966f601d5223a750559cf13d562ac5e5c6d1fcc7217835b01f5fd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x528 902 bytes
embedded_pdf_script_00001fa3.bin
e45f0db5444a350dc36906b62f13de3242a7bcc160612704abd60036808f4770		 pdf-embedded-script PDF raw stream script payload at offset 0x1FA3 14750 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0039_00.bin
1ea3deb9e8fefd18545f049b32b3e41f97022417f1a40126c3434430380af6d5		 pdf-objstm-decoded PDF /ObjStm 39 0 obj (inflated) 1389 bytes
font_00_cff_off00000f11.bin
666463adac6cacb6e214e0e648c340c7321ba33bf110c46c426619784597d466		 pdf-font-stream PDF embedded font (cff) at offset 0xF11 1289 bytes
font_01_sfnt_off000068c7.bin
3a47365ba29be93b97be381e34ec3c7ef0a10e0f82cdb3dadd6fb11f2800fdb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C7 36717 bytes

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