PDF malware analysis — malicious · 9ea9f2fc73e46dc4

MALICIOUS

PDF

33.3 KB

MD5: 33f8b0475d215aa60b19ca2856bddda1 SHA-1: 6de6f864cddd8d597c780c845e99417348c623e8 SHA-256: 9ea9f2fc73e46dc485a0e6f5105722aac05c91b080d0cd8ede0cbd44c1a813f9

132 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204 User Execution

The PDF file contains embedded JavaScript and utilizes PDF filters with exploit indicators, suggesting an attempt to exploit vulnerabilities. The critical heuristic 'EXTRACTED_FILE_CLAMAV' indicates that an extracted artifact, 'javascript_obj0012_000.js', was detected as 'Win.Trojan.Agent-36103'. This strongly suggests the JavaScript is designed to download and execute a secondary malicious payload. The presence of XFA forms and AcroForm buttons further supports the exploitation vector.

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.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `8c08d0f6d0675ca6140d84b243d21d35fbb548cdf0b7cd38918490c281edf950`	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 0xEFA	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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