PDF malware analysis — malicious · b096ca8830e81a89

MALICIOUS

PDF

11.5 KB Created: 2011-02-19 21:50:14 Authoring application: gem bam

MD5: a2d0db67e3e03d56215edec0170d38f8 SHA-1: b3ff2b990818780c3119ac860aeb18b0c4278803 SHA-256: b096ca8830e81a896d95e64616accfd63d5cc9065856467c6079408e1c336bf1

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter

The PDF sample contains critical XFA JavaScript heap-spray exploit code, indicated by multiple high-severity heuristic firings. This exploit code is designed to execute arbitrary code, likely to download and run a second-stage payload. The presence of an embedded file further supports the malicious intent.

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.
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.
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_obj0016.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xA54	84 bytes
`embedded_file_obj0010.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0xB06	228 bytes
`embedded_file_obj0004.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xBF6	199 bytes
`embedded_file_obj0009.bin` `d62d126151962fa5b56073ed39bcb07bfb57d1140134de8a445e74cc436b2bc1`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xCE6	119 bytes
`embedded_file_obj0011.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xD9E	77 bytes
`embedded_file_obj0006.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0xE44	56 bytes
`embedded_file_obj0017.bin` `e90af396673e7e27ee9deacc61fe6fd4133e1b8ef6e673de86f350971874198e`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x117D	11349 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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