PDF malware analysis — malicious · 2653224f479aa10f

MALICIOUS

PDF

70.5 KB

MD5: 635a3598fda2a2ec8bbf1ed681580d8c SHA-1: 65223a58672d81972d0b80d9de50b5c92659f34b SHA-256: 2653224f479aa10f4e82b489987bb519f563786b676bacb76a5efba2963cd546

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Service Execution: JavaScript T1204.002 Malicious Link: Malicious File

The PDF sample contains XFA forms with embedded JavaScript, identified as a heap spray exploit. This script is designed to execute arbitrary code, likely to download and run a secondary payload. The presence of XFA heap spray and embedded script strongly indicates a malicious intent to compromise the user's system.

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.
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` `b5e3e0f1b53b6267af23d3b1b9c03632b53a3160e1341ec1b0f7c5e46949b658`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x43	4194304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 12 long base64-like blob(s).

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