PDF malware analysis — malicious · 1a9ce7e6a6bfedee

MALICIOUS

PDF

8.8 KB

MD5: 5f14b02ca5174d0d408799d27822cf38 SHA-1: 313a5d524605afbe9c20b7ae5ff134542091aae8 SHA-256: 1a9ce7e6a6bfedee3e2e5dabc78a5994a289416ff368e877394b584f585b5c12

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Specifically, a heap spray exploit was detected within a decoded stream, indicating an attempt to execute malicious JavaScript. The script itself, when reconstructed from the numeric character references, forms the URL "http://na-gora.com:8338/pXlQP?expid=4&fid=5", likely intended to download and execute a second-stage payload. This indicates a drive-by download attack pattern.

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_off00000bf2.js` `2c4c57579b28a02019fad6992624f93597fedc3a539e37621938491b07f712da`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xBF2	100002 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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