PDF malware analysis — malicious · df7d4d64c681fdcf

MALICIOUS

PDF

12.7 KB Created: 2010-12-03 12:02:55 Authoring application: mum mig

MD5: 1856004dd93efd10493e516f3dd12601 SHA-1: 2e2aedbce097c694205279be44fafd7c6c2576b0 SHA-256: df7d4d64c681fdcfb0909ee9a371a22c38a0caf6a75816eb1b2e0a78e43c9f53

268 Risk Score

Malware Insights

The PDF sample contains critical XFA JavaScript heap-spray exploit code and an embedded script payload. ML classification and ClamAV detection strongly indicate malicious intent. The primary attack vector appears to be exploiting a vulnerability within the XFA form processing to execute arbitrary code, likely leading to the download and execution of a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

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.
XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
ClamAV: Pdf.Dropper.Agent-7314112-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7314112-0
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.
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.

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0011.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xE7E	84 bytes
`embedded_file_obj0006.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0xF2F	228 bytes
`embedded_file_obj0009.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x101F	199 bytes
`embedded_file_obj0013.bin` `bf86e5ccfa031f80b6ecdda6e88d8dd405ae0fb1222edd125a55b6993357b3a0`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x1110	119 bytes
`embedded_file_obj0008.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x11C7	77 bytes
`embedded_file_obj0007.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x126D	56 bytes
`embedded_file_obj0012.bin` `b8476699e0f0102c3b6fb7511b68214e938d895b62bb897c0105e28a7e310ab9`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x15A7	10986 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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