PDF malware analysis — malicious · cb6074aaa887967b

MALICIOUS

PDF

9.3 KB

MD5: 2c68c89b34ba09374d7478f791c23401 SHA-1: 7faf8ec072e56617084d5f3d12cae665b2c73170 SHA-256: cb6074aaa887967b5f897169aac797226d14a57cd981069eeea30f0d07b12e9d

158 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT heuristics. The ML classifier strongly flags this PDF as malicious. The deobfuscated.js artifact suggests the script is designed to download and execute a secondary payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0041.bin` `85c1bf4ae928f817667e9b167f3b3ce154198010ca3625e73371f1324811dbbc`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1165 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `8ab951ab6243d126d3520c3dc0d26a69f98e5c123677ddec6454068fc0256cce`	deobfuscated-js	PDF JavaScript deobfuscation pass	1473 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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