PDF malware analysis — malicious · f822b2646026eb3b

MALICIOUS

PDF

9.5 KB

MD5: 8a3cd7a5909b88f2603d6a2246e97bff SHA-1: eece665a145520c631cf77e310c1fe4e08d791f2 SHA-256: f822b2646026eb3b14e2b732f2241c3fb80f0addae9ceb66b3be7ad66ff38cb5

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Scripting: JavaScript T1204.002 Malicious Link: Malicious File

The PDF file contains embedded XFA forms with risky executable scripts, indicated by PDF_XFA_SCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. The deobfuscated.js file, extracted as a suspicious artifact, likely contains obfuscated JavaScript code designed to exploit vulnerabilities and download additional payloads. The PDF_EVAL heuristic further suggests the use of JavaScript eval() for code execution. The primary attack pattern involves luring the user into opening the PDF, which then triggers the embedded script to execute malicious actions.

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` `8b610b0f6172f51edba0a1760845bc177f8be0d8a90ecfd929a0d7870fdf7afe`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1163 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `cbf0aa5b833720a4ae91553449eb2436f92e4660fd08c1249ff15b83f9debc94`	deobfuscated-js	PDF JavaScript deobfuscation pass	1613 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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