PDF malware analysis — malicious · 4f4983b7b9aa20e2

MALICIOUS

PDF

9.6 KB Created: 2010-12-09 02:40:16 Authoring application: ichConi wokConi

MD5: b66f25a6fa0ff43602af7ac63ae2ac5e SHA-1: d24f37192631d9c6384c28594e314fe6454b91a8 SHA-256: 4f4983b7b9aa20e21f95b666c7a62b7f3492ec026220268c549eab671a75abbc

226 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF document was flagged as malicious by ClamAV with the signature Pdf.Dropper.Agent-7212492-0. Static analysis revealed the presence of embedded files and risky executable scripts within XFA forms, indicating a dropper or exploit delivery mechanism. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves exploiting PDF vulnerabilities to execute embedded scripts, likely to download and run a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.Dropper.Agent-7212492-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7212492-0
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
Suspicious extracted artifact medium 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 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

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x100D	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x10BE	228 bytes
`embedded_file_obj0010.bin` `122194a07b50a1022098c27b9977f8b0039dd9b91d109067197600565052d205`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x11B0	12297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x1DEB	199 bytes
`embedded_file_obj0012.bin` `c40d123a7c6c9b7dfadc3ded0dfd52a337459d71ae081003892499ad2c7e786c`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x1EDD	131 bytes
`embedded_file_obj0013.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x1F9C	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x2043	56 bytes

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