Office (OLE) malware analysis — malicious · 7996b5ce42e89cff

MALICIOUS

Office (OLE)

396.1 KB

MD5: 30ddcec9b4a6ab0cda1d9b94f034e1fe SHA-1: 0635bad5ff04f86f8942975e3d6a6479f41ec06a SHA-256: 7996b5ce42e89cffe2eabef60fa0056279bc06884cd4c591ab08a10caf34e0c0

358 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File: User Execution: Malicious File

The sample is identified as a malicious PDF dropper by ClamAV. Static analysis reveals critical findings related to XFA forms, heap spray, and embedded script payloads within the PDF structure. The embedded JavaScript, identified as stream_000_off00000049.js, is highly suspicious and likely responsible for downloading and executing a secondary payload. The polyglot nature of the file, embedding a PDF within another structure, further indicates malicious intent.

Heuristics 10

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.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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.
ClamAV: Pdf.Dropper.Agent-7275049-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7275049-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY

OLE file is 405,611 bytes but its declared streams total only 0 bytes — 405,611 bytes (100%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_000_off00000049.js` `0372351f0cb4c23e2ed02ac76db367f727b4464fc4d8fed4166853716cbd9c4f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x49	4194304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`polyglot_child_pdf_off000003e8.pdf` `433d6978d7c6564fe20da8c2734b7c81547a0b4f7802926e65070e29568047f7`	polyglot-child-pdf	Secondary PDF body inside ole container at offset 0x3E8	404611 bytes
Detection ClamAV: Pdf.Dropper.Agent-7255079-0 Obfuscation or payload: unlikely

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