PDF malware analysis — malicious · ec0bb79c09011b4f

MALICIOUS

PDF

33.6 KB

MD5: 6acf8bd3a3791589669a20ad9ea578e3 SHA-1: 74e2493684a305a8de45c44c2ed1dd6959797344 SHA-256: ec0bb79c09011b4f7cba8ea5a6a75ff0c2f9c729804e05422be156cd27266360

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Critical heuristics indicate PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT, suggesting the presence of exploit code within the XFA form's JavaScript. This script is designed to perform a heap spray, a common technique used to reliably trigger memory corruption vulnerabilities. The embedded JavaScript payload, identified as 'stream_000_off0000005b.js', is highly likely to be responsible for downloading and executing a second-stage payload.

Heuristics 8

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.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_off0000005b.js` `ed952394147afa8d0b4546a308ec13f91d5f0e535514e8a13cd3b7ecd30234ca`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5B	84188 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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