PDF malware analysis — malicious · 5537d1bc1ca8939b

MALICIOUS

PDF

42.9 KB

MD5: c2ca2fb114b0540357a7f7ddd8469805 SHA-1: b7fc17a7d94ce8e0bb19fd76865fa22cba700910 SHA-256: 5537d1bc1ca8939b98ac19d507c450fb9d1c0f8ec37abaa49225c983aa9befbb

188 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it is a malicious document. The presence of an embedded script payload and an embedded file, specifically 'embedded_file_obj0014.bin', strongly suggests that this PDF is designed to download and execute a second-stage payload. The document body content appears to be obfuscated or malformed, further supporting the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36836 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36836
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.
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xD7	67 bytes
`embedded_file_obj0009.bin` `425aa3a7624fabf0089a7c06a3ed5e0137648fae532758b21845d9cef157e824`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x162	681 bytes
`embedded_file_obj0010.bin` `e1ab66598406464785df1b7c3e4218452dce39c816aca3e1a181e312cbe8a05c`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x456	93 bytes
`embedded_file_obj0011.bin` `cab1ab59bc3134330d379cfa98e14cfbcf07b7bf29c98920ca7e9d50a83dd294`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x4FE	496 bytes
`embedded_file_obj0012.bin` `6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x739	389 bytes
`embedded_file_obj0014.bin` `e0ac083fdda74d0d58ebb9cf7cf38e94abad501861f40ba19987457832feacff`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x90B	40813 bytes
Detection ClamAV: Pdf.Exploit.Agent-36836 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0015.bin` `51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xA8C2	147 bytes

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