PDF malware analysis — malicious · eb7a691488f020f7

MALICIOUS

PDF

6.3 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap

MD5: e1f402f23a3a70f4bfd8d5a0e7dcdd6b SHA-1: b305a8ecc5dc4398701eee267f7d179226b3103a SHA-256: eb7a691488f020f7f29717ef939727be7f6eb7fc618d272bc7a2c8b518e472a2

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document contains embedded executable scripts and triggers multiple high-severity heuristics, including PDF_EVAL and PDF_XFA_SCRIPT, indicating it is designed to exploit vulnerabilities. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as Pdf.Exploit.Dropped-81. The document likely attempts to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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.
ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.5/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xDB	67 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x165	228 bytes
`embedded_file_obj0010.bin` `eec663e945bf1553f98da0438dcf2de5d490d234b40f733d17f6c5e6bd4dca48`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x293	547 bytes
`embedded_file_obj0011.bin` `18726cf561ec0327e59db76c567fe8973775173fccc607991c5c69800993030d`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x501	411 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0012.bin` `9b326cd444f369d87937a3407264d68a2a4389cb7bb73e1d1cb31457d3ef3f6e`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x6E7	122 bytes
`embedded_file_obj0013.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x7BF	199 bytes
`embedded_file_obj0014.bin` `74376e721748074bfded54795aa95fa421273ef9c575ccbc98a33ec97b4b3091`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x8B1	12228 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).
`embedded_file_obj0015.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x149B	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x152F	56 bytes

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