PDF malware analysis — malicious · bc615ed07a569a57

MALICIOUS

PDF

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

MD5: 05853577a0a72afacd976679a9f7d0aa SHA-1: d387b8168cd93c54627a01b099b42452ea16229f SHA-256: bc615ed07a569a5760bb8660b4f855e3f7ca1d4f14cfb3992dec9edb19a35070

116 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter

The PDF file contains embedded scripts and is flagged by ML classifiers as malicious. Heuristics indicate the presence of XFA forms with risky executable scripts and embedded file payloads. The embedded file 'embedded_file_obj0008.bin' is a strong indicator of a dropper or exploit delivery mechanism. The ML classifier output of 0.999972 further supports the malicious nature of this file.

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` `abea6123d6551b569a48d454d9d43645a95ad665b0e1da0fbbabf2259b8da40f`	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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