PDF malware analysis — malicious · 1f0a674ad9a2b5d2

MALICIOUS

PDF

111.0 KB Created: 2011-06-30 01:43:04 Authoring application: ihw ihw

MD5: db17483c131cd022cc36fa642fe2d48e SHA-1: c3a9066920f847ef64e766d756f4b1c9afd67bf2 SHA-256: 1f0a674ad9a2b5d2b3c22c096bbd294a058bc350d4ca5f826112e85b78ba07dc

136 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059 Command and Scripting Interpreter T1059.007 Command and Scripting Interpreter: JavaScript

The PDF file contains embedded scripts and utilizes XFA forms, which are known vectors for exploiting PDF vulnerabilities. The ML classifier strongly indicates maliciousness. The presence of an embedded script payload and the use of ASCIIHexDecode with exploit indicators suggest the document is designed to download and execute a second-stage payload, likely contained within the largest embedded artifact, 'embedded_file_obj0008.bin'.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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.
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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 0x285	84 bytes
`embedded_file_obj0015.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x375	228 bytes
`embedded_file_obj0009.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x4B8	199 bytes
`embedded_file_obj0007.bin` `5d4e84174057e0420bee56de4c7349843dd5b848aedfa14b52347483a9e7dca5`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x5F9	138 bytes
`embedded_file_obj0016.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x708	77 bytes
`embedded_file_obj0018.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x7EC	56 bytes
`embedded_file_obj0008.bin` `4b35179bb0aa89c19775d3efd1e5bff388af31899e0a1e0369c0b0ead9b05cd5`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xBC0	55530 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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