Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f0a071e6a33d9c…

MALICIOUS

PDF

40.3 KB
MD5: 7e7882e06407333c9000f74fd7fe2a32 SHA-1: e02eec7721917967de8fced41ca15f603e6643ef SHA-256: d2f0a071e6a33d9cddd97ef3077228a789b8e9854b91589a414703c0d8e229c4
132 Risk Score

Malware Insights

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

The PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and an extracted artifact flagged by ClamAV as Win.Trojan.Agent-36103. The presence of JavaScript actions and streams, along with PDF filters that suggest exploit attempts, points towards a malicious document designed to execute code. The extracted JavaScript file, javascript_obj0012_000.js, is likely responsible for initiating the malicious activity.

Heuristics 10

  • 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.
  • 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
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
80d1dec77358eabf7a9a346df0b2998eeb0b4156a60e1621a84b306f39ff2c18		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x3CB 27488 bytes
javascript_obj0012_000.js
78af367b94c1fbc884572a85f9e28b3df7413cb8e4adf783519ae4588a1de39c		 pdf-javascript-stream PDF /JS object 12 at offset 0x2AED 8387 bytes
Detection
ClamAV: Win.Trojan.Agent-36103
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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