PDF malware analysis — malicious · 928bdd60db8fa850

MALICIOUS

PDF

5.8 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap

MD5: dea881f347376b2c826d104dc82b0a94 SHA-1: 98354ff5fd075ad9e57bc46279365793e310dda3 SHA-256: 928bdd60db8fa8503897eab24829304c7be4e6cb36871012a1d4d648b88a6035

176 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Dropped-81, indicating it likely contains an exploit. The presence of embedded files and XFA forms with risky executable scripts further supports this. The primary attack pattern involves exploiting PDF vulnerabilities to deliver a secondary payload, likely a dropper or downloader.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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
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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0006.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x234	84 bytes
`embedded_file_obj0007.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x2E9	228 bytes
`embedded_file_obj0008.bin` `e431fd0d08911d89ae4831e3da8afed3287b2a62e31112cc741d9c7baec93d34`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x3DD	1042 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0009.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x6AB	199 bytes
`embedded_file_obj0010.bin` `49f78de4c208216ea8f2b5df066a01698f10ef7f13ddd8c49da56b91da85887c`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x7A2	10463 bytes
`embedded_file_obj0011.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x10E7	77 bytes
`embedded_file_obj0012.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x1192	56 bytes

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