PDF malware analysis — malicious · a9c0dd5325b7130f

MALICIOUS

PDF

14.7 KB Created: 2010-09-15 17:48:04 Authoring application: sib ilk

MD5: da982b13567f0cb7fd4ec4279e1d9e26 SHA-1: ab01864684d8dd57dc9d8c24ee49561eff24696e SHA-256: a9c0dd5325b7130fb8ae9d68e12a35f7160da083a097cfdeeec099ba36a802d3

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF sample contains multiple high-severity heuristic firings indicating the presence of executable script content and embedded files. Specifically, the PDF_UNESCAPE and PDF_XFA_SCRIPT rules suggest that the document is designed to execute malicious code, likely to download and run a secondary payload. The ML classifier also strongly flags this PDF as malicious. The embedded file 'embedded_file_obj0019.bin' is highly suspicious and likely contains the next stage of the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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_obj0017.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x8ED	84 bytes
`embedded_file_obj0015.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x99F	228 bytes
`embedded_file_obj0006.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0xA8F	199 bytes
`embedded_file_obj0018.bin` `a329e917e7978c520340d7f45517f1ab7f1742300fcb6f62f1d3aaa5918c0b3c`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0xB80	119 bytes
`embedded_file_obj0007.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0xC37	77 bytes
`embedded_file_obj0004.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xCDD	56 bytes
`embedded_file_obj0019.bin` `2b2189ac8c6a5be8ec9644730375c830150aee4b45145d296669bcaf8493ce34`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x1019	29837 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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