PDF malware analysis — malicious · 92d476e8f6565582

MALICIOUS

PDF

18.6 KB Created: 2010-09-04 17:27:12 Authoring application: tamSnap snapSon

MD5: defed6a38396ed2cbf57661ad887a56f SHA-1: e62b2d039e8dcebe2b2efeacb39b6daba83f20db SHA-256: 92d476e8f6565582266c7a438741622a097858dfab6b9a7425f8f0f75990e25a

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF sample contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. Heuristic firings indicate the presence of XFA heap spray exploit code and an embedded script payload. The ML classifier strongly flagged this PDF as malicious. The embedded file, obj0010.bin, likely contains the second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
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_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x11F9	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x12AA	228 bytes
`embedded_file_obj0010.bin` `ce2afae0baab642351d1faa93f774cb9affb6ea7734d4b8b4d1834f6a0e963e5`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x139D	25568 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x41EA	199 bytes
`embedded_file_obj0012.bin` `d5c0be04c46ac1f7d523d955a6ab8aa50363e08076e63efedca0b5538dd14672`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x42DC	131 bytes
`embedded_file_obj0013.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x439C	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x4443	56 bytes

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