PDF malware analysis — malicious · 9f55d6f89bb2494d

MALICIOUS

PDF

15.2 KB Created: 2010-09-09 16:48:01 Authoring application: buy age

MD5: f2041ce2378c1ac19c575b89f694a277 SHA-1: 3616a6241a5902947fd75268a528bc8c502e1080 SHA-256: 9f55d6f89bb2494df7baf06460130f68f8fcb2e781dc63a8306a2d5735409603

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF sample contains critical XFA heap spray exploit code and risky executable script within its XFA form. This indicates the document is designed to exploit a vulnerability, likely to download and execute a second-stage payload, as suggested by the embedded file artifact. The ML classifier strongly supports the malicious nature of this PDF.

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_obj0014.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0xEC2	84 bytes
`embedded_file_obj0008.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xF73	228 bytes
`embedded_file_obj0001.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x1063	199 bytes
`embedded_file_obj0005.bin` `ac83b5f77c73ec98f7c58b2c43d4c4e7fe09317c6c446f660a91ef17320fa467`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x1153	119 bytes
`embedded_file_obj0019.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x120B	77 bytes
`embedded_file_obj0018.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x12B2	56 bytes
`embedded_file_obj0011.bin` `b732150bd769f66070ae15ab6ef5a77ba0b81cebce6bfd67c4ccadeb1e284918`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x15ED	15858 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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