PDF malware analysis — malicious · c09617c7998c402a

MALICIOUS

PDF

24.6 KB

MD5: 74c766c7a084f0f6a1f727818fac11c8 SHA-1: e1c5dbc7431fdae43051a9ebd184ac96cebbcb49 SHA-256: c09617c7998c402afc066d99c861b624001d3cc1839b3e697130d5bd6fb6c372

126 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.007 JavaScript T1566.002 Spearphishing Attachment

The PDF contains high-severity heuristics for XFA forms with risky executable scripts and embedded script payloads. The presence of an embedded file further indicates malicious intent. The script uses unescape() and String.fromCharCode, suggesting obfuscation to hide its true functionality, likely to download and execute a second-stage payload. The embedded file 'embedded_file_obj0008.bin' is a strong indicator of a dropper or exploit delivery mechanism.

Heuristics 8

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
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.
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/xfa-template/2.5/
- http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `5e00a1095cd9d815e1b3d80e31e8e41f6f189d1e315971961f09470d00a89bd6`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xC6	24489 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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