PDF malware analysis — malicious · 21162d064ce9112b

MALICIOUS

PDF

13.4 KB

MD5: 767c2144812dee1453ffdc2005c175d9 SHA-1: 17fd0dcdfb5ef35391ec7c140e9b224e9ccd3222 SHA-256: 21162d064ce9112b3397f4f07861738dd45e2e7b376508964c9ed521fb51abf9

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF sample contains critical heuristic firings for PDF XFA heap spray and embedded script payloads. The extracted JavaScript, although large and potentially obfuscated, is indicative of exploit code designed to leverage this vulnerability. The primary function appears to be the execution of this script, which likely leads to the download and execution of further malicious content.

Heuristics 5

XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
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.
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
`stream_000_off00000043.js` `ab59c8b3c3275b4d8b7f4031984ffae27660cc138197161b6473f84e60e19834`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x43	4194304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.