Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3547b88b0d1bc96…

MALICIOUS

PDF

28.9 KB Created: 2010-08-29 16:19:36 Authoring application: KididiruriqexotyzAsuq GoremhIhunutjo
MD5: ddb47750e5a34d0fe2f8c547dbea1e1c SHA-1: c309a0fac5656074e2b85609803c8ec11b683801 SHA-256: e3547b88b0d1bc962fea9a54f231920b68cf1e1d204ee167bbd8b43bdd4ab68e
268 Risk Score

Malware Insights

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

The PDF file contains high-severity heuristics indicating an XFA form with risky executable script and an eval() call, suggesting exploitation of a PDF vulnerability. ClamAV detections confirm this, identifying it as Pdf.Exploit.Dropped-81 and Pdf.Exploit.Agent-36318. The embedded script payload is likely responsible for downloading and executing a second-stage payload, as indicated by the embedded file artifacts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
  • 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.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x1AB 67 bytes
embedded_file_obj0009.bin
6b2260d3c78649345d3f0b850b831d545d33bb7017ccdf438cdfe1e9db7f2db2		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x238 294 bytes
embedded_file_obj0010.bin
512ab903a777351b89cb8adc39ec31d7d65c892ed0d77d62fd3a3cbcc8629fd4		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x3A9 603 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36318
Obfuscation or payload: unlikely
embedded_file_obj0011.bin
9d4c66b4714216dab3ebfc9d4b322b7258123f651416cdb896a2a76303e2542f		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x64F 26124 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0012.bin
103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6CA6 323 bytes
embedded_file_obj0014.bin
72f5bb950203a4c318c7cf2ee0924374bcbe75f0efee6cfcfea39d7a1d25436a		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x6E33 176 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0015.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x6F29 77 bytes
embedded_file_obj0016.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x6FBD 56 bytes

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