Malicious PDF — malware analysis report

Static analysis result for SHA-256 e790acb7ac81c904…

MALICIOUS

PDF

61.8 KB
MD5: c9b226a1f40f32ab20dca1a7a11b8ffa SHA-1: 72002d04b4416007929954b8849e26d7a7595b90 SHA-256: e790acb7ac81c9044d869d9383290e481111274a4b22f6b6d78990183eedf934
246 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and RichMedia (Flash) content, indicating an attempt to exploit vulnerabilities. ClamAV detected this file as 'Pdf.Exploit.Agent-35955', and a suspicious JavaScript file was extracted. The presence of unescape() calls and ASCIIHexDecode filters further suggests obfuscated malicious code designed to execute an exploit. The primary function appears to be downloading and executing a second-stage payload.

Heuristics 10

  • ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
b52b546f445164350b564869980b2766408aef84eb0be15a0893d30d2249d32f		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x16F8 26804 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
javascript_obj0011_000.js
fabb7722e85f539bee942d8db0d975b545f28910b8a9498779070f6d8607e0ca		 pdf-javascript-stream PDF /JS object 11 at offset 0x2E0 2214 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0013_00.bin
865432820818724db43ce4f41f372656bd654e13c3239fbf54b0e5673968f172		 pdf-objstm-decoded PDF /ObjStm 13 0 obj (inflated) 638 bytes

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