PDF malware analysis — malicious · 91d8755badee6a11

MALICIOUS

PDF

12.7 KB Created: 2010-11-25 12:48:14 Authoring application: shh taj

MD5: 80505a189c2b0a90f673daf0b449c83c SHA-1: 5ca467633fda7d73eea49dbfd37c6395b2484924 SHA-256: 91d8755badee6a11c311c731547d584672ff5b1eb740cb99c81047dbaff47ba8

238 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

This PDF file contains critical XFA heap spray exploit code and risky executable script, as indicated by multiple high and critical heuristic firings. The primary function appears to be the execution of malicious JavaScript, likely to download and execute a second-stage payload. ClamAV detection confirms its malicious nature as Pdf.Dropper.Agent-7283058-0.

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-7283058-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7283058-0
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_obj0004.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xCFE	84 bytes
`embedded_file_obj0003.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xDAF	228 bytes
`embedded_file_obj0002.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xE9F	199 bytes
`embedded_file_obj0015.bin` `431975476382cee6dbc576e19445a42d209e696678ebedcadb2e730bfab4f30e`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xF90	119 bytes
`embedded_file_obj0014.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x1049	77 bytes
`embedded_file_obj0012.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x10F0	56 bytes
`embedded_file_obj0019.bin` `fab09cb7ab33fc9f227a42b6e15d9163ac445847a470e10c088701d0cc682297`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x1428	11590 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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