PDF malware analysis — malicious · b8c1af39f08f6cca

MALICIOUS

PDF

4.3 KB Created: 2011-04-05 23:46:28 Authoring application: bub lob

MD5: 9cd9a2b37e66fb74be047cc5702515e0 SHA-1: 7ce14c1c11f5b184586bc6700ec65c0a191f2234 SHA-256: b8c1af39f08f6cca48b221f80e87d65f3c8c808bb1d31cd8bc43699f1c6d4255

116 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter T1059.007 JavaScript/JScript

The PDF file contains embedded executable content, indicated by multiple PDF-specific heuristic firings including 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'PDF_XFA_SCRIPT'. The ML classifier also flagged this PDF as malicious with high confidence. The embedded file 'embedded_file_obj0008.bin' is likely the second-stage payload. The XFA form and String.fromCharCode usage suggest obfuscation techniques common in PDF-based malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `5a28e8c0844d1ee3bd96a44550401be5ec4f0d19e6987c2123992d88f55167f8`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x167	13036 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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