PDF malware analysis — malicious · f918dd438ce91b08

MALICIOUS

PDF

5.3 KB Authoring application: saerb

MD5: b42f0fb78c68d6ec4a0dec08d2f6763c SHA-1: 52cbd9f53f432c1ec0ea9f77fb0922458239cdbc SHA-256: f918dd438ce91b08568e6067d8774ba85b1c3a715036987dec3f219d5318e798

70 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains an embedded JavaScript payload, identified as 'stream_001_off000002e5.js'. This script is likely responsible for downloading and executing a second-stage payload, which is a common technique for initial access and further system compromise. The presence of an embedded script and the ML classification strongly indicate a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. 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_001_off000002e5.js` `de17455bbf48a5ae3004353e6b3bd436b62ad32730ba8cea0243a13ff5e618b0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E5	65443 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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